91658 has 8 divisors (see below), whose sum is σ = 157152. Its totient is φ = 39276.

The previous prime is 91639. The next prime is 91673. The reversal of 91658 is 85619.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91658.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91658.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3260 + ... + 3287.

It is an arithmetic number, because the mean of its divisors is an integer number (19644).

2⁹¹⁶⁵⁸ is an apocalyptic number.

91658 is a deficient number, since it is larger than the sum of its proper divisors (65494).

91658 is a wasteful number, since it uses less digits than its factorization.

91658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6556.

The product of its digits is 2160, while the sum is 29.

The square root of 91658 is about 302.7507225425. The cubic root of 91658 is about 45.0875661189.

Subtracting from 91658 its product of digits (2160), we obtain a palindrome (89498).

The spelling of 91658 in words is "ninety-one thousand, six hundred fifty-eight".