56515931 has 4 divisors (see below), whose sum is σ = 56586600. Its totient is φ = 56445264.

The previous prime is 56515897. The next prime is 56515961. The reversal of 56515931 is 13951565.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56515931 - 2¹⁸ = 56253787 is a prime.

It is a super-2 number, since 2×56515931² = 6388100913593522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56515891 and 56515900.

It is not an unprimeable number, because it can be changed into a prime (56515961) 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 in 3 ways as a sum of consecutive naturals, for example, 34121 + ... + 35738.

It is an arithmetic number, because the mean of its divisors is an integer number (14146650).

Almost surely, 2^56515931 is an apocalyptic number.

56515931 is a deficient number, since it is larger than the sum of its proper divisors (70669).

56515931 is an equidigital number, since it uses as much as digits as its factorization.

56515931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70668.

The product of its digits is 20250, while the sum is 35.

The square root of 56515931 is about 7517.7078288532. The cubic root of 56515931 is about 383.7575758459.

The spelling of 56515931 in words is "fifty-six million, five hundred fifteen thousand, nine hundred thirty-one".