56581513 has 4 divisors (see below), whose sum is σ = 57141828. Its totient is φ = 56021200.

The previous prime is 56581477. The next prime is 56581519. The reversal of 56581513 is 31518565.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50296464 + 6285049 = 7092^2 + 2507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56581513 is a prime.

It is a super-2 number, since 2×56581513² = 6402935226738338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56581519) 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, 280006 + ... + 280207.

It is an arithmetic number, because the mean of its divisors is an integer number (14285457).

Almost surely, 2^56581513 is an apocalyptic number.

It is an amenable number.

56581513 is a deficient number, since it is larger than the sum of its proper divisors (560315).

56581513 is a wasteful number, since it uses less digits than its factorization.

56581513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560314.

The product of its digits is 18000, while the sum is 34.

The square root of 56581513 is about 7522.0683990509. The cubic root of 56581513 is about 383.9059579641.

The spelling of 56581513 in words is "fifty-six million, five hundred eighty-one thousand, five hundred thirteen".