One hundred million (100,000,000) is the natural number following 99999999 and preceding 100000001.

In scientific notation, it is written as 10⁸.

Selected 9-digit numbers (100000001 - 999999999)

• 102334155 - Fibonacci number
• 107890609 - Wedderburn-Etherington number
• 111111111 - repunit, square root of 12345678987654321
• 111111113 - Chen prime, Sophie Germain prime, cousin prime.
• 123456789 - smallest zeroless pandigital number
• 129140163 = 3¹⁷
• 129644790 - Catalan number
• 134217728 = 2²⁷
• 139854276 - the smallest pandigital square
• 142547559 - Motzkin number
• 165580141 - Fibonacci number
• 179424673 - 10000000th prime number
• 190899322 - Bell number
• 214358881 = 11⁸
• 222222222 - repdigit
• 222222227 - safe prime
• 225058681 - Pell number
• 225331713 - self-descriptive number in base 9
• 244140625 = 5¹¹
• 253450711 - Wedderburn-Etherington number
• 267914296 - Fibonacci number
• 268402687 - Carol number
• 268435456 = 2²⁸
• 268468223 - Kynea number
• 272400600 - the number of terms of the harmonic series required to pass 20
• 275305224 - the number of magic squares of order 5, excluding rotations and reflections
• 282475249 = 7¹⁰
• 333333333 - repdigit
• 367567200 - colossally abundant number
• 381654729 - the only polydivisible number that is also a zeroless pandigital number
• 387420489 = 3¹⁸
• 400763223 - Motzkin number
• 433494437 - Fibonacci number
• 442386619 - alternating factorial
• 444444444 - repdigit
• 477638700 - Catalan number
• 479001599 - factorial prime
• 479001600 = 12!
• 536870912 = 2²⁹
• 543339720 - Pell number
• 554999445 - 9-digit analogue to Kaprekar constant
• 555555555 - repdigit
• 596572387 - Wedderburn-Etherington number
• 666666666 - repdigit
• 701408733 - Fibonacci number
• 715827883 - Wagstaff prime
• 777777777 - repdigit
• 815730721 = 13⁸
• 888888888 - repdigit
• 906150257 - smallest counterexample to the Polya conjecture
• 987654321 - largest zeroless pandigital number
• 999999937 - largest 9-digit prime
• 999999999 - repdigit

See also

• Social Security number