12115309 has 2 divisors, whose sum is σ = 12115310. Its totient is φ = 12115308.

The previous prime is 12115297. The next prime is 12115333. The reversal of 12115309 is 90351121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 521284 = 3405^2 + 722^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115309 - 2⁹ = 12114797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12115309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12115399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057654 + 6057655.

It is an arithmetic number, because the mean of its divisors is an integer number (6057655).

Almost surely, 2^12115309 is an apocalyptic number.

It is an amenable number.

12115309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115309 is an equidigital number, since it uses as much as digits as its factorization.

12115309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 12115309 is about 3480.7052446307. The cubic root of 12115309 is about 229.6738224598.

The spelling of 12115309 in words is "twelve million, one hundred fifteen thousand, three hundred nine".