717869561 has 2 divisors, whose sum is σ = 717869562. Its totient is φ = 717869560.

The previous prime is 717869543. The next prime is 717869611. The reversal of 717869561 is 165968717.

It is an a-pointer prime, because the next prime (717869611) can be obtained adding 717869561 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694006336 + 23863225 = 26344^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 717869561 - 2⁶ = 717869497 is a prime.

It is a super-2 number, since 2×717869561² = 1030673413220665442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (717866561) 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, 358934780 + 358934781.

It is an arithmetic number, because the mean of its divisors is an integer number (358934781).

Almost surely, 2^717869561 is an apocalyptic number.

It is an amenable number.

717869561 is a deficient number, since it is larger than the sum of its proper divisors (1).

717869561 is an equidigital number, since it uses as much as digits as its factorization.

717869561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 717869561 is about 26793.0879332711. The cubic root of 717869561 is about 895.3960611952.

The spelling of 717869561 in words is "seven hundred seventeen million, eight hundred sixty-nine thousand, five hundred sixty-one".