56554721 has 4 divisors (see below), whose sum is σ = 56641200. Its totient is φ = 56468244.

The previous prime is 56554711. The next prime is 56554739. The reversal of 56554721 is 12745565.

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 56554721 - 2¹⁴ = 56538337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56554711) 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, 42251 + ... + 43568.

It is an arithmetic number, because the mean of its divisors is an integer number (14160300).

Almost surely, 2^56554721 is an apocalyptic number.

It is an amenable number.

56554721 is a deficient number, since it is larger than the sum of its proper divisors (86479).

56554721 is an equidigital number, since it uses as much as digits as its factorization.

56554721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86478.

The product of its digits is 42000, while the sum is 35.

The square root of 56554721 is about 7520.2872950440. The cubic root of 56554721 is about 383.8453537622.

It can be divided in two parts, 56554 and 721, that added together give a palindrome (57275).

The spelling of 56554721 in words is "fifty-six million, five hundred fifty-four thousand, seven hundred twenty-one".