56751931 has 2 divisors, whose sum is σ = 56751932. Its totient is φ = 56751930.

The previous prime is 56751907. The next prime is 56751953. The reversal of 56751931 is 13915765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56751931 - 2¹¹ = 56749883 is a prime.

It is a super-2 number, since 2×56751931² = 6441563344457522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56751901) 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, 28375965 + 28375966.

It is an arithmetic number, because the mean of its divisors is an integer number (28375966).

Almost surely, 2^56751931 is an apocalyptic number.

56751931 is a deficient number, since it is larger than the sum of its proper divisors (1).

56751931 is an equidigital number, since it uses as much as digits as its factorization.

56751931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 56751931 is about 7533.3877505409. The cubic root of 56751931 is about 384.2910007558.

The spelling of 56751931 in words is "fifty-six million, seven hundred fifty-one thousand, nine hundred thirty-one".