56138013 has 6 divisors (see below), whose sum is σ = 81088254. Its totient is φ = 37425336.

The previous prime is 56138011. The next prime is 56138023. The reversal of 56138013 is 31083165.

56138013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 55756089 + 381924 = 7467^2 + 618^2 .

It is not a de Polignac number, because 56138013 - 2¹ = 56138011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56138011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3118770 + ... + 3118787.

It is an arithmetic number, because the mean of its divisors is an integer number (13514709).

Almost surely, 2^56138013 is an apocalyptic number.

It is an amenable number.

56138013 is a deficient number, since it is larger than the sum of its proper divisors (24950241).

56138013 is a wasteful number, since it uses less digits than its factorization.

56138013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237563 (or 6237560 counting only the distinct ones).

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

The square root of 56138013 is about 7492.5304804185. The cubic root of 56138013 is about 382.9002755813.

The spelling of 56138013 in words is "fifty-six million, one hundred thirty-eight thousand, thirteen".