157905931 has 2 divisors, whose sum is σ = 157905932. Its totient is φ = 157905930.

The previous prime is 157905919. The next prime is 157905953. The reversal of 157905931 is 139509751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157905931 - 2¹⁹ = 157381643 is a prime.

It is a super-2 number, since 2×157905931² = 49868566089953522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157905431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78952965 + 78952966.

It is an arithmetic number, because the mean of its divisors is an integer number (78952966).

Almost surely, 2^157905931 is an apocalyptic number.

157905931 is a deficient number, since it is larger than the sum of its proper divisors (1).

157905931 is an equidigital number, since it uses as much as digits as its factorization.

157905931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42525, while the sum is 40.

The square root of 157905931 is about 12566.0626689508. The cubic root of 157905931 is about 540.5047076008.

The spelling of 157905931 in words is "one hundred fifty-seven million, nine hundred five thousand, nine hundred thirty-one".