56871931 has 2 divisors, whose sum is σ = 56871932. Its totient is φ = 56871930.

The previous prime is 56871911. The next prime is 56871937. The reversal of 56871931 is 13917865.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56871931 - 2⁷ = 56871803 is a prime.

It is a super-2 number, since 2×56871931² = 6468833071337522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56871937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28435965 + 28435966.

It is an arithmetic number, because the mean of its divisors is an integer number (28435966).

Almost surely, 2^56871931 is an apocalyptic number.

56871931 is a deficient number, since it is larger than the sum of its proper divisors (1).

56871931 is an equidigital number, since it uses as much as digits as its factorization.

56871931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 56871931 is about 7541.3480890355. The cubic root of 56871931 is about 384.5616667614.

The spelling of 56871931 in words is "fifty-six million, eight hundred seventy-one thousand, nine hundred thirty-one".