56625221 has 2 divisors, whose sum is σ = 56625222. Its totient is φ = 56625220.

The previous prime is 56625203. The next prime is 56625227. The reversal of 56625221 is 12252665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47541025 + 9084196 = 6895^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 56625221 - 2⁶ = 56625157 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 (56625227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28312610 + 28312611.

It is an arithmetic number, because the mean of its divisors is an integer number (28312611).

Almost surely, 2^56625221 is an apocalyptic number.

It is an amenable number.

56625221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56625221 is an equidigital number, since it uses as much as digits as its factorization.

56625221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 56625221 is about 7524.9731560983. The cubic root of 56625221 is about 384.0047855487.

Adding to 56625221 its reverse (12252665), we get a palindrome (68877886).

The spelling of 56625221 in words is "fifty-six million, six hundred twenty-five thousand, two hundred twenty-one".