56731 has 2 divisors, whose sum is σ = 56732. Its totient is φ = 56730.

The previous prime is 56713. The next prime is 56737. The reversal of 56731 is 13765.

Together with previous prime (56713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56731 - 2¹³ = 48539 is a prime.

It is a super-2 number, since 2×56731² = 6436812722, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

56731 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (56737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28365 + 28366.

It is an arithmetic number, because the mean of its divisors is an integer number (28366).

2⁵⁶⁷³¹ is an apocalyptic number.

56731 is a deficient number, since it is larger than the sum of its proper divisors (1).

56731 is an equidigital number, since it uses as much as digits as its factorization.

56731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 22.

The square root of 56731 is about 238.1827029824. The cubic root of 56731 is about 38.4243750769.

It can be divided in two parts, 56 and 731, that added together give a palindrome (787).

The spelling of 56731 in words is "fifty-six thousand, seven hundred thirty-one".