122991507 has 8 divisors (see below), whose sum is σ = 182209680. Its totient is φ = 81994320.

The previous prime is 122991493. The next prime is 122991521. The reversal of 122991507 is 705199221.

It is an interprime number because it is at equal distance from previous prime (122991493) and next prime (122991521).

It is not a de Polignac number, because 122991507 - 2⁶ = 122991443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122991307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2277594 + ... + 2277647.

It is an arithmetic number, because the mean of its divisors is an integer number (22776210).

Almost surely, 2^122991507 is an apocalyptic number.

122991507 is a deficient number, since it is larger than the sum of its proper divisors (59218173).

122991507 is an equidigital number, since it uses as much as digits as its factorization.

122991507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555250 (or 4555244 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 122991507 is about 11090.1536057892. The cubic root of 122991507 is about 497.3075366403.

The spelling of 122991507 in words is "one hundred twenty-two million, nine hundred ninety-one thousand, five hundred seven".