12206309 has 2 divisors, whose sum is σ = 12206310. Its totient is φ = 12206308.

The previous prime is 12206291. The next prime is 12206339. The reversal of 12206309 is 90360221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8584900 + 3621409 = 2930^2 + 1903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12206309 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 (12206339) 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 as a sum of consecutive naturals, namely, 6103154 + 6103155.

It is an arithmetic number, because the mean of its divisors is an integer number (6103155).

Almost surely, 2^12206309 is an apocalyptic number.

It is an amenable number.

12206309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12206309 is an equidigital number, since it uses as much as digits as its factorization.

12206309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 12206309 is about 3493.7528533083. The cubic root of 12206309 is about 230.2474274909.

The spelling of 12206309 in words is "twelve million, two hundred six thousand, three hundred nine".