91319 has 4 divisors (see below), whose sum is σ = 93096. Its totient is φ = 89544.

The previous prime is 91309. The next prime is 91331.

91319 is nontrivially palindromic in base 10.

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 91319 - 2⁴ = 91303 is a prime.

It is a super-2 number, since 2×91319² = 16678319522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91294 and 91303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91309) 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, 809 + ... + 914.

It is an arithmetic number, because the mean of its divisors is an integer number (23274).

2⁹¹³¹⁹ is an apocalyptic number.

91319 is a deficient number, since it is larger than the sum of its proper divisors (1777).

91319 is a wasteful number, since it uses less digits than its factorization.

91319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776.

The product of its digits is 243, while the sum is 23.

The square root of 91319 is about 302.1903373703. The cubic root of 91319 is about 45.0319115211.

The spelling of 91319 in words is "ninety-one thousand, three hundred nineteen".