56181731 has 2 divisors, whose sum is σ = 56181732. Its totient is φ = 56181730.

The previous prime is 56181707. The next prime is 56181739. The reversal of 56181731 is 13718165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56181731 - 2⁶ = 56181667 is a prime.

It is a super-2 number, since 2×56181731² = 6312773796312722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56181739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28090865 + 28090866.

It is an arithmetic number, because the mean of its divisors is an integer number (28090866).

Almost surely, 2^56181731 is an apocalyptic number.

56181731 is a deficient number, since it is larger than the sum of its proper divisors (1).

56181731 is an equidigital number, since it uses as much as digits as its factorization.

56181731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 56181731 is about 7495.4473515595. The cubic root of 56181731 is about 382.9996455082. Note that the first 3 decimals are identical.

Adding to 56181731 its reverse (13718165), we get a palindrome (69899896).

The spelling of 56181731 in words is "fifty-six million, one hundred eighty-one thousand, seven hundred thirty-one".