561056189 has 2 divisors, whose sum is σ = 561056190. Its totient is φ = 561056188.

The previous prime is 561056159. The next prime is 561056201. The reversal of 561056189 is 981650165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560505625 + 550564 = 23675^2 + 742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561056189 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561056159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280528094 + 280528095.

It is an arithmetic number, because the mean of its divisors is an integer number (280528095).

Almost surely, 2^561056189 is an apocalyptic number.

It is an amenable number.

561056189 is a deficient number, since it is larger than the sum of its proper divisors (1).

561056189 is an equidigital number, since it uses as much as digits as its factorization.

561056189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 561056189 is about 23686.6246856744. The cubic root of 561056189 is about 824.7749316870.

The spelling of 561056189 in words is "five hundred sixty-one million, fifty-six thousand, one hundred eighty-nine".