561647917 has 2 divisors, whose sum is σ = 561647918. Its totient is φ = 561647916.

The previous prime is 561647903. The next prime is 561647941. The reversal of 561647917 is 719746165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506205001 + 55442916 = 22499^2 + 7446^2 .

It is a cyclic number.

It is not a de Polignac number, because 561647917 - 2¹⁵ = 561615149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561647117) 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, 280823958 + 280823959.

It is an arithmetic number, because the mean of its divisors is an integer number (280823959).

Almost surely, 2^561647917 is an apocalyptic number.

It is an amenable number.

561647917 is a deficient number, since it is larger than the sum of its proper divisors (1).

561647917 is an equidigital number, since it uses as much as digits as its factorization.

561647917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 561647917 is about 23699.1121563657. The cubic root of 561647917 is about 825.0647843830.

The spelling of 561647917 in words is "five hundred sixty-one million, six hundred forty-seven thousand, nine hundred seventeen".