961991717 has 12 divisors (see below), whose sum is σ = 1018298700. Its totient is φ = 908658432.

The previous prime is 961991707. The next prime is 961991753. The reversal of 961991717 is 717199169.

961991717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 611028961 + 350962756 = 24719^2 + 18734^2 .

It is not a de Polignac number, because 961991717 - 2²⁰ = 960943141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961991707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123659 + ... + 131207.

It is an arithmetic number, because the mean of its divisors is an integer number (84858225).

Almost surely, 2^961991717 is an apocalyptic number.

It is an amenable number.

961991717 is a deficient number, since it is larger than the sum of its proper divisors (56306983).

961991717 is a wasteful number, since it uses less digits than its factorization.

961991717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940 (or 7921 counting only the distinct ones).

The product of its digits is 214326, while the sum is 50.

The square root of 961991717 is about 31015.9913109351. The cubic root of 961991717 is about 987.1665802103.

The spelling of 961991717 in words is "nine hundred sixty-one million, nine hundred ninety-one thousand, seven hundred seventeen".