91799 has 4 divisors (see below), whose sum is σ = 94080. Its totient is φ = 89520.

The previous prime is 91781. The next prime is 91801. The reversal of 91799 is 99719.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91799 - 2¹⁶ = 26263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91799.

It is not an unprimeable number, because it can be changed into a prime (91099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (23520).

2⁹¹⁷⁹⁹ is an apocalyptic number.

91799 is a deficient number, since it is larger than the sum of its proper divisors (2281).

91799 is a wasteful number, since it uses less digits than its factorization.

91799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its digits is 5103, while the sum is 35.

The square root of 91799 is about 302.9834979005. The cubic root of 91799 is about 45.1106740844.

The spelling of 91799 in words is "ninety-one thousand, seven hundred ninety-nine".