56646221 has 2 divisors, whose sum is σ = 56646222. Its totient is φ = 56646220.

The previous prime is 56646211. The next prime is 56646229. The reversal of 56646221 is 12264665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 546121 = 7490^2 + 739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56646221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56646229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28323110 + 28323111.

It is an arithmetic number, because the mean of its divisors is an integer number (28323111).

Almost surely, 2^56646221 is an apocalyptic number.

It is an amenable number.

56646221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56646221 is an equidigital number, since it uses as much as digits as its factorization.

56646221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 56646221 is about 7526.3683805671. The cubic root of 56646221 is about 384.0522502866.

The spelling of 56646221 in words is "fifty-six million, six hundred forty-six thousand, two hundred twenty-one".