91992399 has 8 divisors (see below), whose sum is σ = 122828160. Its totient is φ = 61242456.

The previous prime is 91992359. The next prime is 91992421. The reversal of 91992399 is 99329919.

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

It is not a de Polignac number, because 91992399 - 2²³ = 83603791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91992359) 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 7 ways as a sum of consecutive naturals, for example, 18909 + ... + 23270.

It is an arithmetic number, because the mean of its divisors is an integer number (15353520).

Almost surely, 2^91992399 is an apocalyptic number.

91992399 is a deficient number, since it is larger than the sum of its proper divisors (30835761).

91992399 is a wasteful number, since it uses less digits than its factorization.

91992399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42909.

The product of its digits is 354294, while the sum is 51.

The square root of 91992399 is about 9591.2668089257. The cubic root of 91992399 is about 451.4233107300.

The spelling of 91992399 in words is "ninety-one million, nine hundred ninety-two thousand, three hundred ninety-nine".