56081557 has 4 divisors (see below), whose sum is σ = 64093216. Its totient is φ = 48069900.

The previous prime is 56081539. The next prime is 56081569. The reversal of 56081557 is 75518065.

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 56081557 - 2²³ = 47692949 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 (56081587) 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, 4005819 + ... + 4005832.

It is an arithmetic number, because the mean of its divisors is an integer number (16023304).

Almost surely, 2^56081557 is an apocalyptic number.

It is an amenable number.

56081557 is a deficient number, since it is larger than the sum of its proper divisors (8011659).

56081557 is an equidigital number, since it uses as much as digits as its factorization.

56081557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8011658.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 56081557 is about 7488.7620472278. The cubic root of 56081557 is about 382.7718761401.

The spelling of 56081557 in words is "fifty-six million, eighty-one thousand, five hundred fifty-seven".