11209 has 4 divisors (see below), whose sum is σ = 12240. Its totient is φ = 10180.

The previous prime is 11197. The next prime is 11213. The reversal of 11209 is 90211.

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 11209 - 2⁵ = 11177 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11239) 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, 499 + ... + 520.

It is an arithmetic number, because the mean of its divisors is an integer number (3060).

2¹¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

11209 is a deficient number, since it is larger than the sum of its proper divisors (1031).

11209 is a wasteful number, since it uses less digits than its factorization.

11209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 11209 is about 105.8725649071. The cubic root of 11209 is about 22.3797702136.

The spelling of 11209 in words is "eleven thousand, two hundred nine".