12206209 has 2 divisors, whose sum is σ = 12206210. Its totient is φ = 12206208.

The previous prime is 12206203. The next prime is 12206269. The reversal of 12206209 is 90260221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 2093809 = 3180^2 + 1447^2 .

It is a cyclic number.

It is not a de Polignac number, because 12206209 - 2⁵ = 12206177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12206209.

It is not a weakly prime, because it can be changed into another prime (12206203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6103104 + 6103105.

It is an arithmetic number, because the mean of its divisors is an integer number (6103105).

Almost surely, 2^12206209 is an apocalyptic number.

It is an amenable number.

12206209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12206209 is an equidigital number, since it uses as much as digits as its factorization.

12206209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12206209 is about 3493.7385420206. The cubic root of 12206209 is about 230.2467987230.

The spelling of 12206209 in words is "twelve million, two hundred six thousand, two hundred nine".