56115591 has 8 divisors (see below), whose sum is σ = 85509504. Its totient is φ = 32066040.

The previous prime is 56115583. The next prime is 56115599. The reversal of 56115591 is 19551165.

It is an interprime number because it is at equal distance from previous prime (56115583) and next prime (56115599).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56115591 - 2³ = 56115583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56115599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1336065 + ... + 1336106.

It is an arithmetic number, because the mean of its divisors is an integer number (10688688).

Almost surely, 2^56115591 is an apocalyptic number.

56115591 is a deficient number, since it is larger than the sum of its proper divisors (29393913).

56115591 is a wasteful number, since it uses less digits than its factorization.

56115591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672181.

The product of its digits is 6750, while the sum is 33.

The square root of 56115591 is about 7491.0340407717. The cubic root of 56115591 is about 382.8492909169.

The spelling of 56115591 in words is "fifty-six million, one hundred fifteen thousand, five hundred ninety-one".