556913521 has 2 divisors, whose sum is σ = 556913522. Its totient is φ = 556913520.

The previous prime is 556913507. The next prime is 556913527. The reversal of 556913521 is 125319655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285981921 + 270931600 = 16911^2 + 16460^2 .

It is a cyclic number.

It is not a de Polignac number, because 556913521 - 2⁷ = 556913393 is a prime.

It is not a weakly prime, because it can be changed into another prime (556913527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278456760 + 278456761.

It is an arithmetic number, because the mean of its divisors is an integer number (278456761).

Almost surely, 2^556913521 is an apocalyptic number.

It is an amenable number.

556913521 is a deficient number, since it is larger than the sum of its proper divisors (1).

556913521 is an equidigital number, since it uses as much as digits as its factorization.

556913521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 37.

The square root of 556913521 is about 23599.0152548788. The cubic root of 556913521 is about 822.7399525943.

The spelling of 556913521 in words is "five hundred fifty-six million, nine hundred thirteen thousand, five hundred twenty-one".