108689 has 4 divisors (see below), whose sum is σ = 124224. Its totient is φ = 93156.

The previous prime is 108677. The next prime is 108707. The reversal of 108689 is 986801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 108689 - 2¹² = 104593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7757 + ... + 7770.

It is an arithmetic number, because the mean of its divisors is an integer number (31056).

2¹⁰⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

108689 is a deficient number, since it is larger than the sum of its proper divisors (15535).

108689 is an equidigital number, since it uses as much as digits as its factorization.

108689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15534.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 108689 is about 329.6801480223. The cubic root of 108689 is about 47.7230872713.

It can be divided in two parts, 108 and 689, that added together give a palindrome (797).

The spelling of 108689 in words is "one hundred eight thousand, six hundred eighty-nine".