103209 has 4 divisors (see below), whose sum is σ = 137616. Its totient is φ = 68804.

The previous prime is 103183. The next prime is 103217. The reversal of 103209 is 902301.

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 a cyclic number.

It is not a de Polignac number, because 103209 - 2⁵ = 103177 is a prime.

It is a D-number.

It is a Curzon number.

103209 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 103209.

It is not an unprimeable number, because it can be changed into a prime (103289) 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, 17199 + ... + 17204.

It is an arithmetic number, because the mean of its divisors is an integer number (34404).

2¹⁰³²⁰⁹ is an apocalyptic number.

It is an amenable number.

103209 is a deficient number, since it is larger than the sum of its proper divisors (34407).

103209 is an equidigital number, since it uses as much as digits as its factorization.

103209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34406.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 103209 is about 321.2615756669. The cubic root of 103209 is about 46.9071654787.

The spelling of 103209 in words is "one hundred three thousand, two hundred nine".