56015813 has 4 divisors (see below), whose sum is σ = 64018080. Its totient is φ = 48013548.

The previous prime is 56015797. The next prime is 56015831. The reversal of 56015813 is 31851065.

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 not a de Polignac number, because 56015813 - 2⁴ = 56015797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56017813) 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, 4001123 + ... + 4001136.

It is an arithmetic number, because the mean of its divisors is an integer number (16004520).

Almost surely, 2^56015813 is an apocalyptic number.

It is an amenable number.

56015813 is a deficient number, since it is larger than the sum of its proper divisors (8002267).

56015813 is an equidigital number, since it uses as much as digits as its factorization.

56015813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8002266.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 56015813 is about 7484.3712494771. The cubic root of 56015813 is about 382.6222440950.

Adding to 56015813 its reverse (31851065), we get a palindrome (87866878).

The spelling of 56015813 in words is "fifty-six million, fifteen thousand, eight hundred thirteen".