56891553 has 4 divisors (see below), whose sum is σ = 75855408. Its totient is φ = 37927700.

The previous prime is 56891551. The next prime is 56891557. The reversal of 56891553 is 35519865.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56891553 - 2¹ = 56891551 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56891551) 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, 9481923 + ... + 9481928.

It is an arithmetic number, because the mean of its divisors is an integer number (18963852).

Almost surely, 2^56891553 is an apocalyptic number.

It is an amenable number.

56891553 is a deficient number, since it is larger than the sum of its proper divisors (18963855).

56891553 is a wasteful number, since it uses less digits than its factorization.

56891553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18963854.

The product of its digits is 162000, while the sum is 42.

The square root of 56891553 is about 7542.6489378732. The cubic root of 56891553 is about 384.6058889358.

The spelling of 56891553 in words is "fifty-six million, eight hundred ninety-one thousand, five hundred fifty-three".