56787931 has 2 divisors, whose sum is σ = 56787932. Its totient is φ = 56787930.

The previous prime is 56787919. The next prime is 56787937. The reversal of 56787931 is 13978765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56787931 - 2¹³ = 56779739 is a prime.

It is a super-2 number, since 2×56787931² = 6449738214521522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56787937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28393965 + 28393966.

It is an arithmetic number, because the mean of its divisors is an integer number (28393966).

Almost surely, 2^56787931 is an apocalyptic number.

56787931 is a deficient number, since it is larger than the sum of its proper divisors (1).

56787931 is an equidigital number, since it uses as much as digits as its factorization.

56787931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 56787931 is about 7535.7767350154. The cubic root of 56787931 is about 384.3722405865.

The spelling of 56787931 in words is "fifty-six million, seven hundred eighty-seven thousand, nine hundred thirty-one".