157881931 has 2 divisors, whose sum is σ = 157881932. Its totient is φ = 157881930.

The previous prime is 157881917. The next prime is 157881943. The reversal of 157881931 is 139188751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157881931 - 2²¹ = 155784779 is a prime.

It is a super-2 number, since 2×157881931² = 49853408272577522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157881901) 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, 78940965 + 78940966.

It is an arithmetic number, because the mean of its divisors is an integer number (78940966).

Almost surely, 2^157881931 is an apocalyptic number.

157881931 is a deficient number, since it is larger than the sum of its proper divisors (1).

157881931 is an equidigital number, since it uses as much as digits as its factorization.

157881931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 43.

The square root of 157881931 is about 12565.1076796023. The cubic root of 157881931 is about 540.4773225829.

The spelling of 157881931 in words is "one hundred fifty-seven million, eight hundred eighty-one thousand, nine hundred thirty-one".