9117561691 has 16 divisors (see below), whose sum is σ = 10856966400. Its totient is φ = 7491260448.

The previous prime is 9117561679. The next prime is 9117561709. The reversal of 9117561691 is 1961657119.

It is not a de Polignac number, because 9117561691 - 2²⁵ = 9084007259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9117561641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133345 + ... + 189778.

It is an arithmetic number, because the mean of its divisors is an integer number (678560400).

Almost surely, 2^9117561691 is an apocalyptic number.

9117561691 is a deficient number, since it is larger than the sum of its proper divisors (1739404709).

9117561691 is a wasteful number, since it uses less digits than its factorization.

9117561691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323298.

The product of its digits is 102060, while the sum is 46.

The square root of 9117561691 is about 95485.9240464269. The cubic root of 9117561691 is about 2089.1016407993.

The spelling of 9117561691 in words is "nine billion, one hundred seventeen million, five hundred sixty-one thousand, six hundred ninety-one".