91121995 has 8 divisors (see below), whose sum is σ = 109549584. Its totient is φ = 72762144.

The previous prime is 91121981. The next prime is 91122001. The reversal of 91121995 is 59912119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91121995 - 2⁹ = 91121483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13924 + ... + 19393.

It is an arithmetic number, because the mean of its divisors is an integer number (13693698).

Almost surely, 2^91121995 is an apocalyptic number.

91121995 is a deficient number, since it is larger than the sum of its proper divisors (18427589).

91121995 is a wasteful number, since it uses less digits than its factorization.

91121995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33869.

The product of its digits is 7290, while the sum is 37.

The square root of 91121995 is about 9545.7841479891. The cubic root of 91121995 is about 449.9950534436.

The spelling of 91121995 in words is "ninety-one million, one hundred twenty-one thousand, nine hundred ninety-five".