11109209 has 4 divisors (see below), whose sum is σ = 11116980. Its totient is φ = 11101440.

The previous prime is 11109187. The next prime is 11109223. The reversal of 11109209 is 90290111.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 3667225 = 2728^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 11109209 - 2¹⁶ = 11043673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11109289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052 + ... + 4829.

It is an arithmetic number, because the mean of its divisors is an integer number (2779245).

Almost surely, 2^11109209 is an apocalyptic number.

It is an amenable number.

11109209 is a deficient number, since it is larger than the sum of its proper divisors (7771).

11109209 is an equidigital number, since it uses as much as digits as its factorization.

11109209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 11109209 is about 3333.0480044548. The cubic root of 11109209 is about 223.1315826089.

The spelling of 11109209 in words is "eleven million, one hundred nine thousand, two hundred nine".