56658221 has 2 divisors, whose sum is σ = 56658222. Its totient is φ = 56658220.

The previous prime is 56658197. The next prime is 56658227. The reversal of 56658221 is 12285665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 198025 = 7514^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56658221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56658227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28329110 + 28329111.

It is an arithmetic number, because the mean of its divisors is an integer number (28329111).

Almost surely, 2^56658221 is an apocalyptic number.

It is an amenable number.

56658221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56658221 is an equidigital number, since it uses as much as digits as its factorization.

56658221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 56658221 is about 7527.1655355784. The cubic root of 56658221 is about 384.0793677273.

The spelling of 56658221 in words is "fifty-six million, six hundred fifty-eight thousand, two hundred twenty-one".