56422721 has 2 divisors, whose sum is σ = 56422722. Its totient is φ = 56422720.

The previous prime is 56422699. The next prime is 56422747. The reversal of 56422721 is 12722465.

It is a happy number.

56422721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50566321 + 5856400 = 7111^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 56422721 - 2²² = 52228417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56422771) 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 as a sum of consecutive naturals, namely, 28211360 + 28211361.

It is an arithmetic number, because the mean of its divisors is an integer number (28211361).

Almost surely, 2^56422721 is an apocalyptic number.

It is an amenable number.

56422721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56422721 is an equidigital number, since it uses as much as digits as its factorization.

56422721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 56422721 is about 7511.5059076060. The cubic root of 56422721 is about 383.5464865368.

The spelling of 56422721 in words is "fifty-six million, four hundred twenty-two thousand, seven hundred twenty-one".