57115591 has 4 divisors (see below), whose sum is σ = 61509112. Its totient is φ = 52722072.

The previous prime is 57115589. The next prime is 57115621. The reversal of 57115591 is 19551175.

It is a happy number.

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

It is not a de Polignac number, because 57115591 - 2¹ = 57115589 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57115571) 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, 2196741 + ... + 2196766.

It is an arithmetic number, because the mean of its divisors is an integer number (15377278).

Almost surely, 2^57115591 is an apocalyptic number.

57115591 is a deficient number, since it is larger than the sum of its proper divisors (4393521).

57115591 is a wasteful number, since it uses less digits than its factorization.

57115591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393520.

The product of its digits is 7875, while the sum is 34.

The square root of 57115591 is about 7557.4857591662. The cubic root of 57115591 is about 385.1100848970.

The spelling of 57115591 in words is "fifty-seven million, one hundred fifteen thousand, five hundred ninety-one".