56215013 has 4 divisors (see below), whose sum is σ = 58659168. Its totient is φ = 53770860.

The previous prime is 56215009. The next prime is 56215051. The reversal of 56215013 is 31051265.

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 56215013 - 2² = 56215009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 2444131 = 56215013 / (5 + 6 + 2 + 1 + 5 + 0 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56215013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56215063) 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, 1222043 + ... + 1222088.

It is an arithmetic number, because the mean of its divisors is an integer number (14664792).

Almost surely, 2^56215013 is an apocalyptic number.

It is an amenable number.

56215013 is a deficient number, since it is larger than the sum of its proper divisors (2444155).

56215013 is a wasteful number, since it uses less digits than its factorization.

56215013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444154.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 56215013 is about 7497.6671705271. The cubic root of 56215013 is about 383.0752601116.

Adding to 56215013 its reverse (31051265), we get a palindrome (87266278).

The spelling of 56215013 in words is "fifty-six million, two hundred fifteen thousand, thirteen".