56684521 has 4 divisors (see below), whose sum is σ = 56722000. Its totient is φ = 56647044.

The previous prime is 56684519. The next prime is 56684527. The reversal of 56684521 is 12548665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56684521 - 2¹ = 56684519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56684527) 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, 16371 + ... + 19528.

It is an arithmetic number, because the mean of its divisors is an integer number (14180500).

Almost surely, 2^56684521 is an apocalyptic number.

It is an amenable number.

56684521 is a deficient number, since it is larger than the sum of its proper divisors (37479).

56684521 is a wasteful number, since it uses less digits than its factorization.

56684521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37478.

The product of its digits is 57600, while the sum is 37.

The square root of 56684521 is about 7528.9123384457. The cubic root of 56684521 is about 384.1387867291.

The spelling of 56684521 in words is "fifty-six million, six hundred eighty-four thousand, five hundred twenty-one".