108989 has 4 divisors (see below), whose sum is σ = 110556. Its totient is φ = 107424.

The previous prime is 108971. The next prime is 108991. The reversal of 108989 is 989801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989801 = 211 ⋅4691.

It can be written as a sum of positive squares in 2 ways, for example, as 80089 + 28900 = 283^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108929) 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, 674 + ... + 819.

It is an arithmetic number, because the mean of its divisors is an integer number (27639).

2¹⁰⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

108989 is a deficient number, since it is larger than the sum of its proper divisors (1567).

108989 is an equidigital number, since it uses as much as digits as its factorization.

108989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 108989 is about 330.1348209444. The cubic root of 108989 is about 47.7669548628.

The spelling of 108989 in words is "one hundred eight thousand, nine hundred eighty-nine".