56739571531 has 2 divisors, whose sum is σ = 56739571532. Its totient is φ = 56739571530.

The previous prime is 56739571507. The next prime is 56739571561. The reversal of 56739571531 is 13517593765.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56739571531 - 2²⁵ = 56706017099 is a prime.

It is a super-2 number, since 2×56739571531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56739571561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28369785765 + 28369785766.

It is an arithmetic number, because the mean of its divisors is an integer number (28369785766).

Almost surely, 2^56739571531 is an apocalyptic number.

56739571531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56739571531 is an equidigital number, since it uses as much as digits as its factorization.

56739571531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2976750, while the sum is 52.

The spelling of 56739571531 in words is "fifty-six billion, seven hundred thirty-nine million, five hundred seventy-one thousand, five hundred thirty-one".