56155813 has 6 divisors (see below), whose sum is σ = 65324166. Its totient is φ = 48133512.

The previous prime is 56155789. The next prime is 56155831. The reversal of 56155813 is 31855165.

It can be written as a sum of positive squares in only one way, i.e., 33431524 + 22724289 = 5782^2 + 4767^2 .

It is not a de Polignac number, because 56155813 - 2²¹ = 54058661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56155873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572970 + ... + 573067.

It is an arithmetic number, because the mean of its divisors is an integer number (10887361).

Almost surely, 2^56155813 is an apocalyptic number.

It is an amenable number.

56155813 is a deficient number, since it is larger than the sum of its proper divisors (9168353).

56155813 is a wasteful number, since it uses less digits than its factorization.

56155813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146051 (or 1146044 counting only the distinct ones).

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

The square root of 56155813 is about 7493.7182359627. The cubic root of 56155813 is about 382.9407407629.

The spelling of 56155813 in words is "fifty-six million, one hundred fifty-five thousand, eight hundred thirteen".