11139209 has 4 divisors (see below), whose sum is σ = 11148180. Its totient is φ = 11130240.

The previous prime is 11139203. The next prime is 11139211. The reversal of 11139209 is 90293111.

11139209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6175225 + 4963984 = 2485^2 + 2228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11139209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11139203) 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, 2252 + ... + 5229.

It is an arithmetic number, because the mean of its divisors is an integer number (2787045).

Almost surely, 2^11139209 is an apocalyptic number.

It is an amenable number.

11139209 is a deficient number, since it is larger than the sum of its proper divisors (8971).

11139209 is an equidigital number, since it uses as much as digits as its factorization.

11139209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8970.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 11139209 is about 3337.5453554971. The cubic root of 11139209 is about 223.3322548895.

The spelling of 11139209 in words is "eleven million, one hundred thirty-nine thousand, two hundred nine".