56139931 has 2 divisors, whose sum is σ = 56139932. Its totient is φ = 56139930.

The previous prime is 56139907. The next prime is 56139953. The reversal of 56139931 is 13993165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56139931 - 2¹¹ = 56137883 is a prime.

It is a super-2 number, since 2×56139931² = 6303383705369522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56139991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28069965 + 28069966.

It is an arithmetic number, because the mean of its divisors is an integer number (28069966).

Almost surely, 2^56139931 is an apocalyptic number.

56139931 is a deficient number, since it is larger than the sum of its proper divisors (1).

56139931 is an equidigital number, since it uses as much as digits as its factorization.

56139931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 56139931 is about 7492.6584734659. The cubic root of 56139931 is about 382.9046362294.

The spelling of 56139931 in words is "fifty-six million, one hundred thirty-nine thousand, nine hundred thirty-one".