56531709 has 16 divisors (see below), whose sum is σ = 90193600. Its totient is φ = 34788528.

The previous prime is 56531687. The next prime is 56531737. The reversal of 56531709 is 90713565.

It is a happy number.

56531709 is a `hidden beast` number, since 56 + 531 + 70 + 9 = 666.

It is not a de Polignac number, because 56531709 - 2⁷ = 56531581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56531779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80179 + ... + 80880.

It is an arithmetic number, because the mean of its divisors is an integer number (5637100).

Almost surely, 2^56531709 is an apocalyptic number.

It is an amenable number.

56531709 is a deficient number, since it is larger than the sum of its proper divisors (33661891).

56531709 is a wasteful number, since it uses less digits than its factorization.

56531709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161081 (or 161075 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 56531709 is about 7518.7571446350. The cubic root of 56531709 is about 383.7932847369.

The spelling of 56531709 in words is "fifty-six million, five hundred thirty-one thousand, seven hundred nine".