561709957 has 2 divisors, whose sum is σ = 561709958. Its totient is φ = 561709956.

The previous prime is 561709943. The next prime is 561709969. The reversal of 561709957 is 759907165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 283787716 + 277922241 = 16846^2 + 16671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561709957 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561709957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561709927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280854978 + 280854979.

It is an arithmetic number, because the mean of its divisors is an integer number (280854979).

Almost surely, 2^561709957 is an apocalyptic number.

It is an amenable number.

561709957 is a deficient number, since it is larger than the sum of its proper divisors (1).

561709957 is an equidigital number, since it uses as much as digits as its factorization.

561709957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 595350, while the sum is 49.

The square root of 561709957 is about 23700.4210300155. The cubic root of 561709957 is about 825.0951623316.

The spelling of 561709957 in words is "five hundred sixty-one million, seven hundred nine thousand, nine hundred fifty-seven".