56511621 has 64 divisors (see below), whose sum is σ = 95178240. Its totient is φ = 32947200.

The previous prime is 56511613. The next prime is 56511649. The reversal of 56511621 is 12611565.

It is a happy number.

56511621 is a `hidden beast` number, since 5 + 651 + 1 + 6 + 2 + 1 = 666.

56511621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56511621 - 2³ = 56511613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56510621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 559471 + ... + 559571.

It is an arithmetic number, because the mean of its divisors is an integer number (1487160).

Almost surely, 2^56511621 is an apocalyptic number.

56511621 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

56511621 is a deficient number, since it is larger than the sum of its proper divisors (38666619).

56511621 is a wasteful number, since it uses less digits than its factorization.

56511621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 197 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 56511621 is about 7517.4211668630. The cubic root of 56511621 is about 383.7478202651.

The spelling of 56511621 in words is "fifty-six million, five hundred eleven thousand, six hundred twenty-one".