717490981 has 8 divisors (see below), whose sum is σ = 722007000. Its totient is φ = 712988160.

The previous prime is 717490919. The next prime is 717491009. The reversal of 717490981 is 189094717.

It can be written as a sum of positive squares in 4 ways, for example, as 236390625 + 481100356 = 15375^2 + 21934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 717490981 - 2⁷ = 717490853 is a prime.

It is a super-2 number, since 2×717490981² = 1029586615632684722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717493981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119745 + ... + 125593.

It is an arithmetic number, because the mean of its divisors is an integer number (90250875).

Almost surely, 2^717490981 is an apocalyptic number.

It is an amenable number.

717490981 is a deficient number, since it is larger than the sum of its proper divisors (4516019).

717490981 is a wasteful number, since it uses less digits than its factorization.

717490981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 717490981 is about 26786.0221197549. The cubic root of 717490981 is about 895.2386330377.

The spelling of 717490981 in words is "seven hundred seventeen million, four hundred ninety thousand, nine hundred eighty-one".