56809531 has 4 divisors (see below), whose sum is σ = 56826000. Its totient is φ = 56793064.

The previous prime is 56809469. The next prime is 56809537. The reversal of 56809531 is 13590865.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56809531 - 2¹¹ = 56807483 is a prime.

It is a super-2 number, since 2×56809531² = 6454645624879922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56809537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856 + ... + 10693.

It is an arithmetic number, because the mean of its divisors is an integer number (14206500).

Almost surely, 2^56809531 is an apocalyptic number.

56809531 is a deficient number, since it is larger than the sum of its proper divisors (16469).

56809531 is a wasteful number, since it uses less digits than its factorization.

56809531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16468.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 56809531 is about 7537.2097622396. The cubic root of 56809531 is about 384.4209680058.

The spelling of 56809531 in words is "fifty-six million, eight hundred nine thousand, five hundred thirty-one".