56813013 has 18 divisors (see below), whose sum is σ = 85793526. Its totient is φ = 36225552.

The previous prime is 56813011. The next prime is 56813023. The reversal of 56813013 is 31031865.

It can be written as a sum of positive squares in only one way, i.e., 54508689 + 2304324 = 7383^2 + 1518^2 .

It is not a de Polignac number, because 56813013 - 2¹ = 56813011 is a prime.

It is a super-2 number, since 2×56813013² = 6455436892276338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56813011) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1206 + ... + 10727.

It is an arithmetic number, because the mean of its divisors is an integer number (4766307).

Almost surely, 2^56813013 is an apocalyptic number.

It is an amenable number.

56813013 is a deficient number, since it is larger than the sum of its proper divisors (28980513).

56813013 is a wasteful number, since it uses less digits than its factorization.

56813013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11985 (or 11959 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 56813013 is about 7537.4407460358. The cubic root of 56813013 is about 384.4288218902.

Adding to 56813013 its reverse (31031865), we get a palindrome (87844878).

The spelling of 56813013 in words is "fifty-six million, eight hundred thirteen thousand, thirteen".