56861557 has 8 divisors (see below), whose sum is σ = 58363200. Its totient is φ = 55379520.

The previous prime is 56861551. The next prime is 56861569. The reversal of 56861557 is 75516865.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56861557 - 2⁷ = 56861429 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 (56861551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (7295400).

Almost surely, 2^56861557 is an apocalyptic number.

It is an amenable number.

56861557 is a deficient number, since it is larger than the sum of its proper divisors (1501643).

56861557 is an equidigital number, since it uses as much as digits as its factorization.

56861557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9803.

The product of its digits is 252000, while the sum is 43.

The square root of 56861557 is about 7540.6602496068. The cubic root of 56861557 is about 384.5382827284.

The spelling of 56861557 in words is "fifty-six million, eight hundred sixty-one thousand, five hundred fifty-seven".