91998323 has 12 divisors (see below), whose sum is σ = 98453448. Its totient is φ = 85937760.

The previous prime is 91998299. The next prime is 91998329. The reversal of 91998323 is 32389919.

It is not a de Polignac number, because 91998323 - 2⁶ = 91998259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91998329) 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, 24608 + ... + 28098.

It is an arithmetic number, because the mean of its divisors is an integer number (8204454).

Almost surely, 2^91998323 is an apocalyptic number.

91998323 is a deficient number, since it is larger than the sum of its proper divisors (6455125).

91998323 is a wasteful number, since it uses less digits than its factorization.

91998323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3602 (or 3583 counting only the distinct ones).

The product of its digits is 104976, while the sum is 44.

The square root of 91998323 is about 9591.5756265590. The cubic root of 91998323 is about 451.4330005679.

The spelling of 91998323 in words is "ninety-one million, nine hundred ninety-eight thousand, three hundred twenty-three".