56138813 has 2 divisors, whose sum is σ = 56138814. Its totient is φ = 56138812.

The previous prime is 56138807. The next prime is 56138833. The reversal of 56138813 is 31883165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39476089 + 16662724 = 6283^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 56138813 - 2⁸ = 56138557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56138833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28069406 + 28069407.

It is an arithmetic number, because the mean of its divisors is an integer number (28069407).

Almost surely, 2^56138813 is an apocalyptic number.

It is an amenable number.

56138813 is a deficient number, since it is larger than the sum of its proper divisors (1).

56138813 is an equidigital number, since it uses as much as digits as its factorization.

56138813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 56138813 is about 7492.5838667312. The cubic root of 56138813 is about 382.9020944247.

The spelling of 56138813 in words is "fifty-six million, one hundred thirty-eight thousand, eight hundred thirteen".