56183991 has 16 divisors (see below), whose sum is σ = 77813760. Its totient is φ = 36015840.

The previous prime is 56183971. The next prime is 56184001. The reversal of 56183991 is 19938165.

It is not a de Polignac number, because 56183991 - 2¹⁵ = 56151223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56183971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22386 + ... + 24768.

It is an arithmetic number, because the mean of its divisors is an integer number (4863360).

Almost surely, 2^56183991 is an apocalyptic number.

56183991 is a deficient number, since it is larger than the sum of its proper divisors (21629769).

56183991 is a wasteful number, since it uses less digits than its factorization.

56183991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its digits is 58320, while the sum is 42.

The square root of 56183991 is about 7495.5981082233. The cubic root of 56183991 is about 383.0047810305.

The spelling of 56183991 in words is "fifty-six million, one hundred eighty-three thousand, nine hundred ninety-one".