9191910091 has 16 divisors (see below), whose sum is σ = 11349531648. Its totient is φ = 7249312800.

The previous prime is 9191910083. The next prime is 9191910109. The reversal of 9191910091 is 1900191919.

9191910091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9191910091 - 2³ = 9191910083 is a prime.

It is a super-2 number, since 2×9191910091² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9191910001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134095 + ... + 190696.

It is an arithmetic number, because the mean of its divisors is an integer number (709345728).

Almost surely, 2^9191910091 is an apocalyptic number.

9191910091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9191910091 is a deficient number, since it is larger than the sum of its proper divisors (2157621557).

9191910091 is a wasteful number, since it uses less digits than its factorization.

9191910091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325122.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 9191910091 is about 95874.4496255389. The cubic root of 9191910091 is about 2094.7647441188.

The spelling of 9191910091 in words is "nine billion, one hundred ninety-one million, nine hundred ten thousand, ninety-one".