56536621 has 4 divisors (see below), whose sum is σ = 56582172. Its totient is φ = 56491072.

The previous prime is 56536619. The next prime is 56536639. The reversal of 56536621 is 12663565.

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 18232900 + 38303721 = 4270^2 + 6189^2 .

It is a cyclic number.

It is not a de Polignac number, because 56536621 - 2¹ = 56536619 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 (56536651) 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, 20860 + ... + 23413.

It is an arithmetic number, because the mean of its divisors is an integer number (14145543).

Almost surely, 2^56536621 is an apocalyptic number.

It is an amenable number.

56536621 is a deficient number, since it is larger than the sum of its proper divisors (45551).

56536621 is a wasteful number, since it uses less digits than its factorization.

56536621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45550.

The product of its digits is 32400, while the sum is 34.

The square root of 56536621 is about 7519.0837872709. The cubic root of 56536621 is about 383.8044002568.

The spelling of 56536621 in words is "fifty-six million, five hundred thirty-six thousand, six hundred twenty-one".