108209 has 4 divisors (see below), whose sum is σ = 108900. Its totient is φ = 107520.

The previous prime is 108203. The next prime is 108211. The reversal of 108209 is 902801.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902801 = 911 ⋅991.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 34225 = 272^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 108209 - 2⁴ = 108193 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (108203) 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, 17 + ... + 465.

It is an arithmetic number, because the mean of its divisors is an integer number (27225).

2¹⁰⁸²⁰⁹ is an apocalyptic number.

It is an amenable number.

108209 is a deficient number, since it is larger than the sum of its proper divisors (691).

108209 is an equidigital number, since it uses as much as digits as its factorization.

108209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 108209 is about 328.9513641863. The cubic root of 108209 is about 47.6527309146.

The spelling of 108209 in words is "one hundred eight thousand, two hundred nine".