12185309 has 2 divisors, whose sum is σ = 12185310. Its totient is φ = 12185308.

The previous prime is 12185293. The next prime is 12185339. The reversal of 12185309 is 90358121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 5189284 = 2645^2 + 2278^2 .

It is a cyclic number.

It is not a de Polignac number, because 12185309 - 2⁴ = 12185293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12185339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6092654 + 6092655.

It is an arithmetic number, because the mean of its divisors is an integer number (6092655).

Almost surely, 2^12185309 is an apocalyptic number.

It is an amenable number.

12185309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12185309 is an equidigital number, since it uses as much as digits as its factorization.

12185309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12185309 is about 3490.7461952998. The cubic root of 12185309 is about 230.1153107992.

The spelling of 12185309 in words is "twelve million, one hundred eighty-five thousand, three hundred nine".