56505731 has 2 divisors, whose sum is σ = 56505732. Its totient is φ = 56505730.

The previous prime is 56505721. The next prime is 56505767. The reversal of 56505731 is 13750565.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56505731 is a prime.

It is a super-2 number, since 2×56505731² = 6385795271688722, which contains 22 as substring.

It is equal to p_3366644 and since 56505731 and 3366644 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (56505721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28252865 + 28252866.

It is an arithmetic number, because the mean of its divisors is an integer number (28252866).

Almost surely, 2^56505731 is an apocalyptic number.

56505731 is a deficient number, since it is larger than the sum of its proper divisors (1).

56505731 is an equidigital number, since it uses as much as digits as its factorization.

56505731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 56505731 is about 7517.0293999691. The cubic root of 56505731 is about 383.7344875903.

The spelling of 56505731 in words is "fifty-six million, five hundred five thousand, seven hundred thirty-one".