56749531 has 2 divisors, whose sum is σ = 56749532. Its totient is φ = 56749530.

The previous prime is 56749529. The next prime is 56749547. The reversal of 56749531 is 13594765.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56749531 - 2¹ = 56749529 is a prime.

It is a super-2 number, since 2×56749531² = 6441018537439922, which contains 22 as substring.

Together with 56749529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56749501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28374765 + 28374766.

It is an arithmetic number, because the mean of its divisors is an integer number (28374766).

Almost surely, 2^56749531 is an apocalyptic number.

56749531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56749531 is an equidigital number, since it uses as much as digits as its factorization.

56749531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 56749531 is about 7533.2284579721. The cubic root of 56749531 is about 384.2855835457.

The spelling of 56749531 in words is "fifty-six million, seven hundred forty-nine thousand, five hundred thirty-one".