56689931 has 2 divisors, whose sum is σ = 56689932. Its totient is φ = 56689930.

The previous prime is 56689909. The next prime is 56689937. The reversal of 56689931 is 13998665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56689931 - 2²² = 52495627 is a prime.

It is a super-2 number, since 2×56689931² = 6427496553569522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56689937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28344965 + 28344966.

It is an arithmetic number, because the mean of its divisors is an integer number (28344966).

Almost surely, 2^56689931 is an apocalyptic number.

56689931 is a deficient number, since it is larger than the sum of its proper divisors (1).

56689931 is an equidigital number, since it uses as much as digits as its factorization.

56689931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The square root of 56689931 is about 7529.2716115173. The cubic root of 56689931 is about 384.1510071418.

The spelling of 56689931 in words is "fifty-six million, six hundred eighty-nine thousand, nine hundred thirty-one".