8561245717 has 2 divisors, whose sum is σ = 8561245718. Its totient is φ = 8561245716.

The previous prime is 8561245699. The next prime is 8561245723. The reversal of 8561245717 is 7175421658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5194229041 + 3367016676 = 72071^2 + 58026^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561245717 - 2²⁷ = 8427027989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8561245757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280622858 + 4280622859.

It is an arithmetic number, because the mean of its divisors is an integer number (4280622859).

Almost surely, 2^8561245717 is an apocalyptic number.

It is an amenable number.

8561245717 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561245717 is an equidigital number, since it uses as much as digits as its factorization.

8561245717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 46.

The square root of 8561245717 is about 92526.9999351541. Note that the first 4 decimals coincide. The cubic root of 8561245717 is about 2045.7174700899.

The spelling of 8561245717 in words is "eight billion, five hundred sixty-one million, two hundred forty-five thousand, seven hundred seventeen".