13391 has 4 divisors (see below), whose sum is σ = 15312. Its totient is φ = 11472.

The previous prime is 13381. The next prime is 13397. The reversal of 13391 is 19331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19331 = 13 ⋅1487.

It is a cyclic number.

It is not a de Polignac number, because 13391 - 2⁶ = 13327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13397) 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, 950 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (3828).

2¹³³⁹¹ is an apocalyptic number.

13391 is a deficient number, since it is larger than the sum of its proper divisors (1921).

13391 is an equidigital number, since it uses as much as digits as its factorization.

13391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its digits is 81, while the sum is 17.

The square root of 13391 is about 115.7194884192. The cubic root of 13391 is about 23.7467585604.

It can be divided in two parts, 13 and 391, that added together give a palindrome (404).

The spelling of 13391 in words is "thirteen thousand, three hundred ninety-one".