717489961 has 8 divisors (see below), whose sum is σ = 729896904. Its totient is φ = 705187200.

The previous prime is 717489911. The next prime is 717490021. The reversal of 717489961 is 169984717.

It can be written as a sum of positive squares in 4 ways, for example, as 535644736 + 181845225 = 23144^2 + 13485^2 .

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 717489961 - 2⁹ = 717489449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 717489899 and 717489908.

It is not an unprimeable number, because it can be changed into a prime (717489901) 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, 12090 + ... + 39763.

It is an arithmetic number, because the mean of its divisors is an integer number (91237113).

Almost surely, 2^717489961 is an apocalyptic number.

It is an amenable number.

717489961 is a deficient number, since it is larger than the sum of its proper divisors (12406943).

717489961 is a wasteful number, since it uses less digits than its factorization.

717489961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52091.

The product of its digits is 762048, while the sum is 52.

The square root of 717489961 is about 26786.0030799670. The cubic root of 717489961 is about 895.2382088076.

The spelling of 717489961 in words is "seven hundred seventeen million, four hundred eighty-nine thousand, nine hundred sixty-one".