12331309 has 2 divisors, whose sum is σ = 12331310. Its totient is φ = 12331308.

The previous prime is 12331303. The next prime is 12331337. The reversal of 12331309 is 90313321.

12331309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11222500 + 1108809 = 3350^2 + 1053^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331309 - 2³ = 12331301 is a prime.

It is a super-2 number, since 2×12331309² = 304122363306962, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12331309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165654 + 6165655.

It is an arithmetic number, because the mean of its divisors is an integer number (6165655).

Almost surely, 2^12331309 is an apocalyptic number.

It is an amenable number.

12331309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331309 is an equidigital number, since it uses as much as digits as its factorization.

12331309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 12331309 is about 3511.5963606314. The cubic root of 12331309 is about 231.0307174783.

The spelling of 12331309 in words is "twelve million, three hundred thirty-one thousand, three hundred nine".