561799109 has 2 divisors, whose sum is σ = 561799110. Its totient is φ = 561799108.

The previous prime is 561799093. The next prime is 561799111. The reversal of 561799109 is 901997165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307300900 + 254498209 = 17530^2 + 15953^2 .

It is a cyclic number.

It is not a de Polignac number, because 561799109 - 2⁴ = 561799093 is a prime.

Together with 561799111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561799159) 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, 280899554 + 280899555.

It is an arithmetic number, because the mean of its divisors is an integer number (280899555).

Almost surely, 2^561799109 is an apocalyptic number.

It is an amenable number.

561799109 is a deficient number, since it is larger than the sum of its proper divisors (1).

561799109 is an equidigital number, since it uses as much as digits as its factorization.

561799109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 561799109 is about 23702.3017658623. The cubic root of 561799109 is about 825.1388117819.

The spelling of 561799109 in words is "five hundred sixty-one million, seven hundred ninety-nine thousand, one hundred nine".