56505881 has 4 divisors (see below), whose sum is σ = 56521764. Its totient is φ = 56490000.

The previous prime is 56505877. The next prime is 56505887. The reversal of 56505881 is 18850565.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 39000025 = 4184^2 + 6245^2 .

It is a cyclic number.

It is not a de Polignac number, because 56505881 - 2² = 56505877 is a prime.

It is a super-2 number, since 2×56505881² = 6385829175172322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56505887) 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, 131 + ... + 10631.

It is an arithmetic number, because the mean of its divisors is an integer number (14130441).

Almost surely, 2^56505881 is an apocalyptic number.

It is an amenable number.

56505881 is a deficient number, since it is larger than the sum of its proper divisors (15883).

56505881 is a wasteful number, since it uses less digits than its factorization.

56505881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15882.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 56505881 is about 7517.0393773081. The cubic root of 56505881 is about 383.7348271436.

The spelling of 56505881 in words is "fifty-six million, five hundred five thousand, eight hundred eighty-one".