56686813 has 2 divisors, whose sum is σ = 56686814. Its totient is φ = 56686812.

The previous prime is 56686783. The next prime is 56686829. The reversal of 56686813 is 31868665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42224004 + 14462809 = 6498^2 + 3803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56686813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56686813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56686843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28343406 + 28343407.

It is an arithmetic number, because the mean of its divisors is an integer number (28343407).

Almost surely, 2^56686813 is an apocalyptic number.

It is an amenable number.

56686813 is a deficient number, since it is larger than the sum of its proper divisors (1).

56686813 is an equidigital number, since it uses as much as digits as its factorization.

56686813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 56686813 is about 7529.0645501284. The cubic root of 56686813 is about 384.1439641227.

The spelling of 56686813 in words is "fifty-six million, six hundred eighty-six thousand, eight hundred thirteen".