91699 has 4 divisors (see below), whose sum is σ = 92664. Its totient is φ = 90736.

The previous prime is 91691. The next prime is 91703. The reversal of 91699 is 99619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 91699 - 2³ = 91691 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (91691) 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, 322 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (23166).

2⁹¹⁶⁹⁹ is an apocalyptic number.

91699 is a deficient number, since it is larger than the sum of its proper divisors (965).

91699 is a wasteful number, since it uses less digits than its factorization.

91699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964.

The product of its digits is 4374, while the sum is 34.

The square root of 91699 is about 302.8184274446. The cubic root of 91699 is about 45.0942878986.

The spelling of 91699 in words is "ninety-one thousand, six hundred ninety-nine".