561561599 has 2 divisors, whose sum is σ = 561561600. Its totient is φ = 561561598.

The previous prime is 561561509. The next prime is 561561607. The reversal of 561561599 is 995165165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561561599 - 2¹⁶ = 561496063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561561509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280780799 + 280780800.

It is an arithmetic number, because the mean of its divisors is an integer number (280780800).

Almost surely, 2^561561599 is an apocalyptic number.

561561599 is a deficient number, since it is larger than the sum of its proper divisors (1).

561561599 is an equidigital number, since it uses as much as digits as its factorization.

561561599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 47.

The square root of 561561599 is about 23697.2909633148. The cubic root of 561561599 is about 825.0225149656.

The spelling of 561561599 in words is "five hundred sixty-one million, five hundred sixty-one thousand, five hundred ninety-nine".