13611209 has 2 divisors, whose sum is σ = 13611210. Its totient is φ = 13611208.

The previous prime is 13611187. The next prime is 13611217. The reversal of 13611209 is 90211631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 6615184 = 2645^2 + 2572^2 .

It is an emirp because it is prime and its reverse (90211631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13611209 - 2²⁰ = 12562633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13611229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6805604 + 6805605.

It is an arithmetic number, because the mean of its divisors is an integer number (6805605).

Almost surely, 2^13611209 is an apocalyptic number.

It is an amenable number.

13611209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13611209 is an equidigital number, since it uses as much as digits as its factorization.

13611209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 13611209 is about 3689.3372033470. The cubic root of 13611209 is about 238.7621975987.

The spelling of 13611209 in words is "thirteen million, six hundred eleven thousand, two hundred nine".