56053991 has 6 divisors (see below), whose sum is σ = 65205720. Its totient is φ = 48046236.

The previous prime is 56053973. The next prime is 56054023. The reversal of 56053991 is 19935065.

It is a de Polignac number, because none of the positive numbers 2^k-56053991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56053931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 571931 + ... + 572028.

It is an arithmetic number, because the mean of its divisors is an integer number (10867620).

Almost surely, 2^56053991 is an apocalyptic number.

56053991 is a deficient number, since it is larger than the sum of its proper divisors (9151729).

56053991 is a wasteful number, since it uses less digits than its factorization.

56053991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143973 (or 1143966 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 56053991 is about 7486.9213298925. The cubic root of 56053991 is about 382.7091507132.

The spelling of 56053991 in words is "fifty-six million, fifty-three thousand, nine hundred ninety-one".