107 (one hundred [and] seven) is the natural number following 106 and preceding 108.

In mathematics

107 is the 28th prime number. The next prime is 109, with which it comprises a twin prime, making 107 a Chen prime.^[1]

Plugged into the equation ${\displaystyle 2^{p}-1}$, 107 yields 162259276829213363391578010288127, a Mersenne prime.^[2] 107 is itself a safe prime.^[3]

It is the fourth Busy beaver number, the maximum number of steps that any Turing machine with 2 symbols and 4 states can make before eventually halting.^[4]

In other fields

As "one hundred and seven", it is the smallest positive integer requiring six syllables in English (without the "and" it only has five syllables and seventy-seven is a smaller 5-syllable number).

107 is also:

• The atomic number of bohrium.
• The emergency telephone number in Argentina and Cape Town.
• The telephone of the police in Hungary.
• A common designation for the fair use exception in copyright law (from 17 U.S.C. 107)
• Peugeot 107 model of car

In sports

• The 107% rule, a Formula One Sporting Regulation in operation from 1996 to 2002 and 2011 onwards
• The number 107 is also associated with the Timbers Army supporters group of the Portland Timbers soccer team, in reference to the stadium seating section where the group originally congregated.