56628521 has 2 divisors, whose sum is σ = 56628522. Its totient is φ = 56628520.

The previous prime is 56628499. The next prime is 56628541. The reversal of 56628521 is 12582665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50197225 + 6431296 = 7085^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 56628521 - 2¹⁴ = 56612137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56628541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28314260 + 28314261.

It is an arithmetic number, because the mean of its divisors is an integer number (28314261).

Almost surely, 2^56628521 is an apocalyptic number.

It is an amenable number.

56628521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56628521 is an equidigital number, since it uses as much as digits as its factorization.

56628521 is an evil number, because the sum of its binary digits is even.

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

The square root of 56628521 is about 7525.1924227889. The cubic root of 56628521 is about 384.0122450703.

The spelling of 56628521 in words is "fifty-six million, six hundred twenty-eight thousand, five hundred twenty-one".