206109 has 6 divisors (see below), whose sum is σ = 297726. Its totient is φ = 137400.

The previous prime is 206083. The next prime is 206123. The reversal of 206109 is 901602.

206109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 205209 + 900 = 453^2 + 30^2 .

It is not a de Polignac number, because 206109 - 2⁵ = 206077 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 206091 and 206100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206179) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11442 + ... + 11459.

It is an arithmetic number, because the mean of its divisors is an integer number (49621).

2²⁰⁶¹⁰⁹ is an apocalyptic number.

It is an amenable number.

206109 is a deficient number, since it is larger than the sum of its proper divisors (91617).

206109 is a wasteful number, since it uses less digits than its factorization.

206109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22907 (or 22904 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 206109 is about 453.9922906834. The cubic root of 206109 is about 59.0698206261.

The spelling of 206109 in words is "two hundred six thousand, one hundred nine".