561344209 has 2 divisors, whose sum is σ = 561344210. Its totient is φ = 561344208.

The previous prime is 561344197. The next prime is 561344219. The reversal of 561344209 is 902443165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382319809 + 179024400 = 19553^2 + 13380^2 .

It is a cyclic number.

It is not a de Polignac number, because 561344209 - 2⁷ = 561344081 is a prime.

It is not a weakly prime, because it can be changed into another prime (561344219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280672104 + 280672105.

It is an arithmetic number, because the mean of its divisors is an integer number (280672105).

Almost surely, 2^561344209 is an apocalyptic number.

It is an amenable number.

561344209 is a deficient number, since it is larger than the sum of its proper divisors (1).

561344209 is an equidigital number, since it uses as much as digits as its factorization.

561344209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 561344209 is about 23692.7037081039. The cubic root of 561344209 is about 824.9160411652.

The spelling of 561344209 in words is "five hundred sixty-one million, three hundred forty-four thousand, two hundred nine".