56621521 has 8 divisors (see below), whose sum is σ = 62514144. Its totient is φ = 50853120.

The previous prime is 56621491. The next prime is 56621557. The reversal of 56621521 is 12512665.

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

It is a cyclic number.

It is not a de Polignac number, because 56621521 - 2¹¹ = 56619473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56621521.

It is not an unprimeable number, because it can be changed into a prime (56621821) 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, 30096 + ... + 31921.

It is an arithmetic number, because the mean of its divisors is an integer number (7814268).

Almost surely, 2^56621521 is an apocalyptic number.

It is an amenable number.

56621521 is a deficient number, since it is larger than the sum of its proper divisors (5892623).

56621521 is a wasteful number, since it uses less digits than its factorization.

56621521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62111.

The product of its digits is 3600, while the sum is 28.

The square root of 56621521 is about 7524.7273040290. The cubic root of 56621521 is about 383.9964214980.

The spelling of 56621521 in words is "fifty-six million, six hundred twenty-one thousand, five hundred twenty-one".