56231555 has 4 divisors (see below), whose sum is σ = 67477872. Its totient is φ = 44985240.

The previous prime is 56231537. The next prime is 56231561. The reversal of 56231555 is 55513265.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55513265 = 5 ⋅11102653.

It is not a de Polignac number, because 56231555 - 2⁸ = 56231299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5623151 + ... + 5623160.

It is an arithmetic number, because the mean of its divisors is an integer number (16869468).

Almost surely, 2^56231555 is an apocalyptic number.

56231555 is a deficient number, since it is larger than the sum of its proper divisors (11246317).

56231555 is a wasteful number, since it uses less digits than its factorization.

56231555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11246316.

The product of its digits is 22500, while the sum is 32.

The square root of 56231555 is about 7498.7702325115. The cubic root of 56231555 is about 383.1128313887.

The spelling of 56231555 in words is "fifty-six million, two hundred thirty-one thousand, five hundred fifty-five".