56455621 has 2 divisors, whose sum is σ = 56455622. Its totient is φ = 56455620.

The previous prime is 56455613. The next prime is 56455627. The reversal of 56455621 is 12655465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 14062500 = 6511^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 56455621 - 2³ = 56455613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56455627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28227810 + 28227811.

It is an arithmetic number, because the mean of its divisors is an integer number (28227811).

Almost surely, 2^56455621 is an apocalyptic number.

It is an amenable number.

56455621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56455621 is an equidigital number, since it uses as much as digits as its factorization.

56455621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 34.

The square root of 56455621 is about 7513.6955621052. The cubic root of 56455621 is about 383.6210205031.

The spelling of 56455621 in words is "fifty-six million, four hundred fifty-five thousand, six hundred twenty-one".