9109920091 has 2 divisors, whose sum is σ = 9109920092. Its totient is φ = 9109920090.

The previous prime is 9109920041. The next prime is 9109920163. The reversal of 9109920091 is 1900299019.

It is a weak prime.

It is an emirp because it is prime and its reverse (1900299019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9109920091 - 2⁹ = 9109919579 is a prime.

It is not a weakly prime, because it can be changed into another prime (9109920041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4554960045 + 4554960046.

It is an arithmetic number, because the mean of its divisors is an integer number (4554960046).

Almost surely, 2^9109920091 is an apocalyptic number.

9109920091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9109920091 is an equidigital number, since it uses as much as digits as its factorization.

9109920091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 9109920091 is about 95445.9013839777. The cubic root of 9109920091 is about 2088.5178392067.

The spelling of 9109920091 in words is "nine billion, one hundred nine million, nine hundred twenty thousand, ninety-one".