107 (number)

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 expression ${\displaystyle 2^{p}-1}$, 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]

It is the number of triangle-free graphs on 7 vertices.^[5]

It is the ninth emirp, because reversing its digits gives another prime number (701)

107 is also:

• The emergency telephone number in Argentina and Cape Town.
• The telephone of the police in Hungary.

In sports

• The 107% rule, a Formula One Sporting Regulation in operation from 1996 to 2002 and 2011 onward.
• 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.