561699557 has 2 divisors, whose sum is σ = 561699558. Its totient is φ = 561699556.

The previous prime is 561699539. The next prime is 561699577. The reversal of 561699557 is 755996165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557243236 + 4456321 = 23606^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 561699557 - 2⁶ = 561699493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561699499 and 561699508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561699517) 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, 280849778 + 280849779.

It is an arithmetic number, because the mean of its divisors is an integer number (280849779).

Almost surely, 2^561699557 is an apocalyptic number.

It is an amenable number.

561699557 is a deficient number, since it is larger than the sum of its proper divisors (1).

561699557 is an equidigital number, since it uses as much as digits as its factorization.

561699557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2551500, while the sum is 53.

The square root of 561699557 is about 23700.2016236149. The cubic root of 561699557 is about 825.0900701172.

The spelling of 561699557 in words is "five hundred sixty-one million, six hundred ninety-nine thousand, five hundred fifty-seven".