108891 has 16 divisors (see below), whose sum is σ = 167200. Its totient is φ = 69984.

The previous prime is 108887. The next prime is 108893. The reversal of 108891 is 198801.

It is not a de Polignac number, because 108891 - 2² = 108887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (10450).

2¹⁰⁸⁸⁹¹ is an apocalyptic number.

108891 is a deficient number, since it is larger than the sum of its proper divisors (58309).

108891 is a wasteful number, since it uses less digits than its factorization.

108891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 108891 is about 329.9863633546. The cubic root of 108891 is about 47.7526336458.

It can be divided in two parts, 108 and 891, that added together give a palindrome (999).

The spelling of 108891 in words is "one hundred eight thousand, eight hundred ninety-one".