91318 has 4 divisors (see below), whose sum is σ = 136980. Its totient is φ = 45658.

The previous prime is 91309. The next prime is 91331. The reversal of 91318 is 81319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81319 = 7 ⋅11617.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22828 + ... + 22831.

It is an arithmetic number, because the mean of its divisors is an integer number (34245).

2⁹¹³¹⁸ is an apocalyptic number.

91318 is a deficient number, since it is larger than the sum of its proper divisors (45662).

91318 is a wasteful number, since it uses less digits than its factorization.

91318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45661.

The product of its digits is 216, while the sum is 22.

The square root of 91318 is about 302.1886827795. The cubic root of 91318 is about 45.0317471447.

Subtracting from 91318 its reverse (81319), we obtain a palindrome (9999).

The spelling of 91318 in words is "ninety-one thousand, three hundred eighteen".