656797931 has 2 divisors, whose sum is σ = 656797932. Its totient is φ = 656797930.

The previous prime is 656797927. The next prime is 656797943. The reversal of 656797931 is 139797656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656797931 - 2² = 656797927 is a prime.

It is a super-2 number, since 2×656797931² = 862767044331761522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656997931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328398965 + 328398966.

It is an arithmetic number, because the mean of its divisors is an integer number (328398966).

Almost surely, 2^656797931 is an apocalyptic number.

656797931 is a deficient number, since it is larger than the sum of its proper divisors (1).

656797931 is an equidigital number, since it uses as much as digits as its factorization.

656797931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2143260, while the sum is 53.

The square root of 656797931 is about 25628.0692015610. The cubic root of 656797931 is about 869.2484507985.

The spelling of 656797931 in words is "six hundred fifty-six million, seven hundred ninety-seven thousand, nine hundred thirty-one".