56506013 has 4 divisors (see below), whose sum is σ = 56802048. Its totient is φ = 56209980.

The previous prime is 56506001. The next prime is 56506031. The reversal of 56506013 is 31060565.

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: 31060565 = 5 ⋅6212113.

It is a cyclic number.

It is not a de Polignac number, because 56506013 - 2⁴ = 56505997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56506033) 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, 147731 + ... + 148112.

It is an arithmetic number, because the mean of its divisors is an integer number (14200512).

Almost surely, 2^56506013 is an apocalyptic number.

It is an amenable number.

56506013 is a deficient number, since it is larger than the sum of its proper divisors (296035).

56506013 is a wasteful number, since it uses less digits than its factorization.

56506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296034.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 56506013 is about 7517.0481573554. The cubic root of 56506013 is about 383.7351259500.

Adding to 56506013 its reverse (31060565), we get a palindrome (87566578).

The spelling of 56506013 in words is "fifty-six million, five hundred six thousand, thirteen".