56551621 has 8 divisors (see below), whose sum is σ = 64956800. Its totient is φ = 48228048.

The previous prime is 56551613. The next prime is 56551699. The reversal of 56551621 is 12615565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56551621 - 2³ = 56551613 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 (56551021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18906 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (8119600).

Almost surely, 2^56551621 is an apocalyptic number.

It is an amenable number.

56551621 is a deficient number, since it is larger than the sum of its proper divisors (8405179).

56551621 is a wasteful number, since it uses less digits than its factorization.

56551621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40803.

The product of its digits is 9000, while the sum is 31.

The square root of 56551621 is about 7520.0811830724. The cubic root of 56551621 is about 383.8383402461.

The spelling of 56551621 in words is "fifty-six million, five hundred fifty-one thousand, six hundred twenty-one".