56139913 has 4 divisors (see below), whose sum is σ = 56930688. Its totient is φ = 55349140.

The previous prime is 56139907. The next prime is 56139931. The reversal of 56139913 is 31993165.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31993165 = 5 ⋅6398633.

It is a cyclic number.

It is not a de Polignac number, because 56139913 - 2²⁵ = 22585481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56139953) 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, 395281 + ... + 395422.

It is an arithmetic number, because the mean of its divisors is an integer number (14232672).

Almost surely, 2^56139913 is an apocalyptic number.

It is an amenable number.

56139913 is a deficient number, since it is larger than the sum of its proper divisors (790775).

56139913 is an equidigital number, since it uses as much as digits as its factorization.

56139913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790774.

The product of its digits is 21870, while the sum is 37.

The square root of 56139913 is about 7492.6572722900. The cubic root of 56139913 is about 382.9045953062.

The spelling of 56139913 in words is "fifty-six million, one hundred thirty-nine thousand, nine hundred thirteen".