561999913 has 2 divisors, whose sum is σ = 561999914. Its totient is φ = 561999912.

The previous prime is 561999901. The next prime is 561999929. The reversal of 561999913 is 319999165.

561999913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394737424 + 167262489 = 19868^2 + 12933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561999913 is a prime.

It is not a weakly prime, because it can be changed into another prime (561999943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280999956 + 280999957.

It is an arithmetic number, because the mean of its divisors is an integer number (280999957).

Almost surely, 2^561999913 is an apocalyptic number.

It is an amenable number.

561999913 is a deficient number, since it is larger than the sum of its proper divisors (1).

561999913 is an equidigital number, since it uses as much as digits as its factorization.

561999913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 590490, while the sum is 52.

The square root of 561999913 is about 23706.5373473226. The cubic root of 561999913 is about 825.2371099305.

The spelling of 561999913 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred thirteen".