9116351991 has 12 divisors (see below), whose sum is σ = 13169404768. Its totient is φ = 6076949184.

The previous prime is 9116351989. The next prime is 9116352023. The reversal of 9116351991 is 1991536119.

9116351991 is a `hidden beast` number, since 9 + 1 + 1 + 635 + 1 + 9 + 9 + 1 = 666.

9116351991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9116351991 - 2¹ = 9116351989 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 (9116351191) 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, 52866 + ... + 145008.

Almost surely, 2^9116351991 is an apocalyptic number.

9116351991 is a deficient number, since it is larger than the sum of its proper divisors (4053052777).

9116351991 is a wasteful number, since it uses less digits than its factorization.

9116351991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103142 (or 103139 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 9116351991 is about 95479.5893948021. The cubic root of 9116351991 is about 2089.0092440922.

The spelling of 9116351991 in words is "nine billion, one hundred sixteen million, three hundred fifty-one thousand, nine hundred ninety-one".