1,000,000,000

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1000000000
104 105 106 107 108 109
Cardinal	One billion (short scale) One thousand million, or one milliard (long scale)
Ordinal	One billionth (short scale)
Factorization	29 59
Greek numeral	${\displaystyle {\stackrel {\iota }{\mathrm {M} }}}$
Roman numeral	M
Binary	1110111001101011001010000000002
Ternary	21202002000210100013
Senary	2431212453446
Octal	73465450008
Duodecimal	23AA9385412
Hexadecimal	3B9ACA0016

1,000,000,000 (one

One billion years may be called an eon in astronomy or geology.

Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is not common anymore, and the word has been used to mean one thousand million (1,000,000,000) for several decades.^[4]

The term milliard could also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English,^[5] variations on this name often appear in other languages.

In the

1,000,000,000 is also the cube of 1000.

Sense of scale

The facts below give a sense of how large 1,000,000,000 (10⁹) is in the context of time according to current scientific evidence:

Time

• 10⁹ seconds (1 gigasecond) equal 11,574 days, 1 hour, 46 minutes and 40 seconds (approximately 31.7 years, or 31 years, 8 months, 8 days).
• About 10⁹ minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10⁹ minutes is roughly 1,901 years.)
• About 10⁹ hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10⁹ hours is roughly 114,080 years.)
• About 10⁹ days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10⁹ days is roughly 2.738 million years.)
• About 10⁹ months ago, dinosaurs walked the Earth during the late Cretaceous. (10⁹ months is roughly 83.3 million years.)
• About 10⁹ years—a
  gigaannus—ago, the first multicellular eukaryotes
  appeared on Earth.
• About 10⁹ decades ago, the thin disk of the Milky Way started to form. (10⁹ decades is exactly 10 billion years.)
• The universe is thought to be about 13.8 × 10⁹ years old.^[6]

Distance

• 10⁹ inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
• 10⁹
  gigametre) is almost three times the distance from the Earth to the Moon
  .
• 10⁹
  terametre) is over six times the distance from the Earth to the Sun
  .

• Any object that weighs one billion kilograms (2.2×10⁹ lb) would weigh about as much as 5,525 empty Boeing 747-400s.
• A cube of iron that weighs one billion pounds (450,000,000 kg) would be 38.62 metres (126.7 ft) on each side.

Products

• As of July 2016, Apple has sold one billion iPhones.^[7] This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube.
• As of January 2023, Facebook has 2.963 billion users.^[8]

Nature

• A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
• There are billions of worker ants in the largest ant colony in the world,^[9] which covers almost 4,000 miles (6,400 km) of the Mediterranean coast.
• In 1804, the world population was one billion.

Count

A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million A-sized cubes in C; and 1,000,000,000 A-sized cubes in D.

Selected 10-digit numbers (1,000,000,001–9,999,999,999)

1,000,000,001 to 1,999,999,999

• 1,000,000,007 : smallest prime number with 10 digits.^[10]
• 1,000,006,281 : smallest triangular number with 10 digits and the 44,721st triangular number.
• 1,000,014,129 = 31623², the smallest ten-digit square.
• 1,003,003,001 = 1001³, palindromic cube
• 1,023,456,789 : smallest pandigital number in decimal.^[11]
• 1,026,753,849 = 32043², the smallest pandigital square in base 10.
• 1,069,863,695 = number of square (0,1)-matrices without zero rows and with exactly 9 entries equal to 1^[12]
• 1,073,741,824 = 32768² = 1024³ = 64⁵ = 32⁶ = 8¹⁰ = 4¹⁵ = 2³⁰
• 1,073,742,724 : Leyland number
• 1,073,792,449 : Leyland number
• 1,093,104,961 = number of (unordered, unlabeled) rooted trimmed trees with 28 nodes^[13]
• 1,104,891,746 = number of partially ordered set with 12 unlabeled elements^[14]
• 1,111,111,111 : repunit, also a special number relating to the passing of Unix time.
• 1,129,760,415 = 23rd Motzkin number.^[15]
• 1,134,903,170 = 45th
  Fibonacci number
  .
• 1,139,733,677 : number k such that the sum of the squares of the first k primes is divisible by k.^[16]
• 1,160,290,625 = 65⁵
• 1,162,261,467 = 3¹⁹
• 1,162,268,326 : Leyland number
• 1,166,732,814 = number of signed trees with 17 nodes^[17]
• 1,173,741,824 : Leyland number
• 1,220,703,125 = 5¹³
• 1,221,074,418 : Leyland number
• 1,232,922,769 : Centered hexagonal number.
• 1,234,567,890 : pandigital number with the digits in order.
• 1,252,332,576 = 66⁵
• 1,280,000,000 = 20⁷
• 1,291,467,969 = 35937² = 1089³ = 33⁶
• 1,311,738,121 : 25th Pell number.^[18]
• 1,350,125,107 = 67⁵
• 1,382,958,545 : 15th Bell number.^[19]
• 1,392,251,012 : number of secondary structures of RNA molecules with 27 nucleotides^[20]
• 1,405,695,061 : Markov prime
• 1,406,818,759 : 30th Wedderburn–Etherington number.^[21]
• 1,421,542,641 : logarithmic number.^[22]
• 1,425,893,465 = Population of the
  People's Republic of China in 2018.^[23][24]
• 1,453,933,568 = 68⁵
• 1,464,407,113 : number of series-reduced trees with 39 nodes[25]
• 1,466,439,680 : number of independent vertex sets and vertex covers in the 21-sunlet graph^[26]
• 1,475,789,056 = 38416² = 196⁴ = 14⁸
• 1,528,823,808 = 1152³
• 1,533,776,805 : pentagonal triangular number
• 1,544,804,416 = 39304² = 1156³ = 34⁶
• 1,564,031,349 = 69⁵
• 1,606,879,040 : Dowling number^[27]
• 1,631,432,881 = 40391², square triangular number
• 1,661,392,258 : n such that n divides (3ⁿ + 5)^[28]
• 1,673,196,525 : Least common multiple of the odd integers from 1 to 25
• 1,677,922,740 : number of series-reduced planted trees with 36 nodes^[29]
• 1,680,700,000 = 70⁵
• 1,755,206,648 : coefficient of a ménage hit polynomial^[30]
• 1,767,263,190 = ${\displaystyle C(19)={\frac {\binom {2\times 19}{19}}{19+1}}={\frac {(2\times 19)!}{19!\times (19+1)!}}}$^[31]
• 1,787,109,376 : 1-automorphic number^[32]
• 1,801,088,541 = 21⁷
• 1,804,229,351 = 71⁵
• 1,808,141,741 : number of partitions of 280 into divisors of 280^[33]
• 1,808,676,326 : number of 38-bead necklaces (turning over is allowed) where complements are equivalent^[34]
• 1,836,311,903 : 46th Fibonacci number.
• 1,838,265,625 = 42875² = 1225³ = 35⁶
• 1,848,549,332 : number of partitions of 270 into divisors of 270^[33]
• 1,857,283,156 : number of 37-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed^[35]
• 1,882,341,361 : The smallest prime whose reversal is a square triangular number (triangular of 57121).
• 1,934,917,632 = 72⁵
• 1,934,502,740 : number of parallelogram polyominoes with 27 cells.^[36]
• 1,996,813,914 : Leyland number
• 1,977,326,743 = 7¹¹
• 1,921,525,212 : number of partitions of 264 into divisors of 264^[33]

2,000,000,000 to 2,999,999,999

• 2,023,443,032 = number of trees with 28 unlabeled nodes^[37]
• 2,038,074,743 = 100,000,000th prime number
• 2,062,142,876 = number of centered hydrocarbons with 30 carbon atoms^[38]
• 2,073,071,593 = 73⁵
• 2,082,061,899 = multiplicative inverse of 40,014 modulo 2,147,483,563
• 2,147,483,563 = prime number, used as the modulus for the combined linear congruential generator
• bit
  integer.
• 2,147,483,648 = 2³¹
• 2,147,484,609 = Leyland number
• 2,176,782,336 = 46656² = 1296³ = 216⁴ = 36⁶ = 6¹²
• 2,179,768,320 = Leyland number
• 2,214,502,422 = 6th primary pseudoperfect number.^[39]
• 2,219,006,624 = 74⁵
• 2,222,222,222 = repdigit
• 2,276,423,485 = number of ways to partition {1,2,...,12} and then partition each cell (block) into subcells.^[40]
• 2,333,606,816 = ${\displaystyle \sum _{d|34}{\binom {34}{d}}}$^[41]
• 2,357,947,691 = 1331³ = 11⁹
• 2,373,046,875 = 75⁵
• 2,494,357,888 = 22⁷
• 2,521,008,887 = 4th Mills' prime
• 2,535,525,376 = 76⁵
• 2,562,890,625 = 50625² = 225⁴ = 15⁸
• 2,565,726,409 = 50653² = 1369³ = 37⁶
• 2,573,571,875 = 5⁵×7^7[42]
• 2,695,730,992 = number of (unordered, unlabeled) rooted trimmed trees with 29 nodes^[13]
• 2,706,784,157 = 77⁵
• 2,873,403,980 = number of uniform rooted trees with 27 nodes^[43]
• 2,834,510,744 = number of nonequivalent dissections of an 22-gon into 19 polygons by nonintersecting diagonals up to rotation^[44]
• 2,887,174,368 = 78⁵
• 2,971,215,073 = 11th Fibonacci prime (47th Fibonacci number) and a Markov prime.