561595553 has 2 divisors, whose sum is σ = 561595554. Its totient is φ = 561595552.

The previous prime is 561595549. The next prime is 561595591. The reversal of 561595553 is 355595165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541632529 + 19963024 = 23273^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 561595553 - 2² = 561595549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (561595543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280797776 + 280797777.

It is an arithmetic number, because the mean of its divisors is an integer number (280797777).

Almost surely, 2^561595553 is an apocalyptic number.

It is an amenable number.

561595553 is a deficient number, since it is larger than the sum of its proper divisors (1).

561595553 is an equidigital number, since it uses as much as digits as its factorization.

561595553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 506250, while the sum is 44.

The square root of 561595553 is about 23698.0073634894. The cubic root of 561595553 is about 825.0391425567.

The spelling of 561595553 in words is "five hundred sixty-one million, five hundred ninety-five thousand, five hundred fifty-three".