561812717 has 2 divisors, whose sum is σ = 561812718. Its totient is φ = 561812716.

The previous prime is 561812707. The next prime is 561812723. The reversal of 561812717 is 717218165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370986121 + 190826596 = 19261^2 + 13814^2 .

It is a cyclic number.

It is not a de Polignac number, because 561812717 - 2⁴ = 561812701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561812707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280906358 + 280906359.

It is an arithmetic number, because the mean of its divisors is an integer number (280906359).

Almost surely, 2^561812717 is an apocalyptic number.

It is an amenable number.

561812717 is a deficient number, since it is larger than the sum of its proper divisors (1).

561812717 is an equidigital number, since it uses as much as digits as its factorization.

561812717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 38.

The square root of 561812717 is about 23702.5888248520. The cubic root of 561812717 is about 825.1454739489.

The spelling of 561812717 in words is "five hundred sixty-one million, eight hundred twelve thousand, seven hundred seventeen".