108391 has 4 divisors (see below), whose sum is σ = 109512. Its totient is φ = 107272.

The previous prime is 108379. The next prime is 108401. The reversal of 108391 is 193801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193801 = 43 ⋅4507.

It is a cyclic number.

It is not a de Polignac number, because 108391 - 2⁵ = 108359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400 + ... + 613.

It is an arithmetic number, because the mean of its divisors is an integer number (27378).

2¹⁰⁸³⁹¹ is an apocalyptic number.

108391 is a deficient number, since it is larger than the sum of its proper divisors (1121).

108391 is a wasteful number, since it uses less digits than its factorization.

108391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

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

The square root of 108391 is about 329.2278846027. The cubic root of 108391 is about 47.6794321416.

The spelling of 108391 in words is "one hundred eight thousand, three hundred ninety-one".