56513261 has 4 divisors (see below), whose sum is σ = 64586592. Its totient is φ = 48439932.

The previous prime is 56513251. The next prime is 56513291. The reversal of 56513261 is 16231565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56513261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56513251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4036655 + ... + 4036668.

It is an arithmetic number, because the mean of its divisors is an integer number (16146648).

Almost surely, 2^56513261 is an apocalyptic number.

It is an amenable number.

56513261 is a deficient number, since it is larger than the sum of its proper divisors (8073331).

56513261 is an equidigital number, since it uses as much as digits as its factorization.

56513261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073330.

The product of its digits is 5400, while the sum is 29.

The square root of 56513261 is about 7517.5302460316. The cubic root of 56513261 is about 383.7515324239.

The spelling of 56513261 in words is "fifty-six million, five hundred thirteen thousand, two hundred sixty-one".