561536923 has 2 divisors, whose sum is σ = 561536924. Its totient is φ = 561536922.

The previous prime is 561536897. The next prime is 561536929. The reversal of 561536923 is 329635165.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561536923 - 2⁵ = 561536891 is a prime.

It is not a weakly prime, because it can be changed into another prime (561536929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280768461 + 280768462.

It is an arithmetic number, because the mean of its divisors is an integer number (280768462).

Almost surely, 2^561536923 is an apocalyptic number.

561536923 is a deficient number, since it is larger than the sum of its proper divisors (1).

561536923 is an equidigital number, since it uses as much as digits as its factorization.

561536923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 40.

The square root of 561536923 is about 23696.7703073647. The cubic root of 561536923 is about 825.0104304772.

The spelling of 561536923 in words is "five hundred sixty-one million, five hundred thirty-six thousand, nine hundred twenty-three".