56081881 has 4 divisors (see below), whose sum is σ = 56918992. Its totient is φ = 55244772.

The previous prime is 56081873. The next prime is 56081887. The reversal of 56081881 is 18818065.

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 56081881 - 2³ = 56081873 is a prime.

It is a super-2 number, since 2×56081881² = 6290354752996322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56081881.

It is not an unprimeable number, because it can be changed into a prime (56081887) 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, 418455 + ... + 418588.

It is an arithmetic number, because the mean of its divisors is an integer number (14229748).

Almost surely, 2^56081881 is an apocalyptic number.

It is an amenable number.

56081881 is a deficient number, since it is larger than the sum of its proper divisors (837111).

56081881 is an equidigital number, since it uses as much as digits as its factorization.

56081881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837110.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 56081881 is about 7488.7836796105. The cubic root of 56081881 is about 382.7726132680.

The spelling of 56081881 in words is "fifty-six million, eighty-one thousand, eight hundred eighty-one".