556000561 has 2 divisors, whose sum is σ = 556000562. Its totient is φ = 556000560.

The previous prime is 556000541. The next prime is 556000579. The reversal of 556000561 is 165000655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513294336 + 42706225 = 22656^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 556000561 - 2⁷ = 556000433 is a prime.

It is not a weakly prime, because it can be changed into another prime (556000541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278000280 + 278000281.

It is an arithmetic number, because the mean of its divisors is an integer number (278000281).

Almost surely, 2^556000561 is an apocalyptic number.

It is an amenable number.

556000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

556000561 is an equidigital number, since it uses as much as digits as its factorization.

556000561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 556000561 is about 23579.6641409499. The cubic root of 556000561 is about 822.2901284236.

The spelling of 556000561 in words is "five hundred fifty-six million, five hundred sixty-one", and thus it is an aban number.