56508891 has 4 divisors (see below), whose sum is σ = 75345192. Its totient is φ = 37672592.

The previous prime is 56508889. The next prime is 56508911. The reversal of 56508891 is 19880565.

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 56508891 - 2¹ = 56508889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56508811) 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, 9418146 + ... + 9418151.

It is an arithmetic number, because the mean of its divisors is an integer number (18836298).

Almost surely, 2^56508891 is an apocalyptic number.

56508891 is a deficient number, since it is larger than the sum of its proper divisors (18836301).

56508891 is a wasteful number, since it uses less digits than its factorization.

56508891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18836300.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 56508891 is about 7517.2395864439. The cubic root of 56508891 is about 383.7416407195.

It can be divided in two parts, 5650 and 8891, that added together give a palindrome (14541).

The spelling of 56508891 in words is "fifty-six million, five hundred eight thousand, eight hundred ninety-one".