561679561 has 2 divisors, whose sum is σ = 561679562. Its totient is φ = 561679560.

The previous prime is 561679549. The next prime is 561679583. The reversal of 561679561 is 165976165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522991161 + 38688400 = 22869^2 + 6220^2 .

It is a cyclic number.

It is not a de Polignac number, because 561679561 - 2⁵ = 561679529 is a prime.

It is not a weakly prime, because it can be changed into another prime (561679361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280839780 + 280839781.

It is an arithmetic number, because the mean of its divisors is an integer number (280839781).

Almost surely, 2^561679561 is an apocalyptic number.

It is an amenable number.

561679561 is a deficient number, since it is larger than the sum of its proper divisors (1).

561679561 is an equidigital number, since it uses as much as digits as its factorization.

561679561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 561679561 is about 23699.7797669092. The cubic root of 561679561 is about 825.0802791791.

The spelling of 561679561 in words is "five hundred sixty-one million, six hundred seventy-nine thousand, five hundred sixty-one".