56859991 has 4 divisors (see below), whose sum is σ = 57792184. Its totient is φ = 55927800.

The previous prime is 56859977. The next prime is 56860003. The reversal of 56859991 is 19995865.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56859991 - 2¹⁵ = 56827223 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 (56859911) 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, 466005 + ... + 466126.

It is an arithmetic number, because the mean of its divisors is an integer number (14448046).

Almost surely, 2^56859991 is an apocalyptic number.

56859991 is a deficient number, since it is larger than the sum of its proper divisors (932193).

56859991 is an equidigital number, since it uses as much as digits as its factorization.

56859991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932192.

The product of its digits is 874800, while the sum is 52.

The square root of 56859991 is about 7540.5564118306. The cubic root of 56859991 is about 384.5347525608.

The spelling of 56859991 in words is "fifty-six million, eight hundred fifty-nine thousand, nine hundred ninety-one".