Orders of Magnitude (numbers) - 109

109

(1000000000; 10003; short scale: one billion; long scale: one thousand million, or one milliard)

ISO: giga- (G)

• Internet: Approximately 1,000,000,000 active users were on Facebook as of October 2012.
• Demography: The population of Africa reached 1,000,000,000 sometime in 2009.
• Demographics — India: 1,210,000,000 – approximate population of India in 2011
• Demographics — China: 1,347,000,000 – approximate population of the People's Republic of China in 2011.
• Computing — Computational limit of a 32-bit CPU: 2 147 483 647 is equal to 231−1, and as such is the largest number which can fit into a signed (two's complement) 32-bit integer on a computer, thus marking the upper computational limit of a 32-bit CPU such as Intel's Pentium-class computer chips.
• BioMed — base pairs in the genome: approximately 3×109 base pairs in the human genome
• Linguistics: 3,400,000,000 – the total number of speakers of Indo-European languages, of which 2,400,000,000 are native speakers; the other 1,000,000,000 speak Indo-European languages as a second language
• Computing – IPv4: 4,294,967,296 (232) possible unique IP addresses.
• Computing: 4,294,967,296 – the number of bytes in 4 gibibytes; in computation, the 32-bit computers can directly access 232 pieces of address space, this leads directly to the 4 gigabyte limit on main memory.
• Mathematics: 4,294,967,297 is a Fermat number and semiprime. It is the smallest number of the form which is not a prime number.
• Demographics — world population: 7,000,000,000 – Estimated population for the world on 31 October 2011, the Day of Seven Billion.