12942509 has 2 divisors, whose sum is σ = 12942510. Its totient is φ = 12942508.

The previous prime is 12942487. The next prime is 12942521. The reversal of 12942509 is 90524921.

12942509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9030025 + 3912484 = 3005^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 12942509 - 2²⁰ = 11893933 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12942539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6471254 + 6471255.

It is an arithmetic number, because the mean of its divisors is an integer number (6471255).

Almost surely, 2^12942509 is an apocalyptic number.

It is an amenable number.

12942509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12942509 is an equidigital number, since it uses as much as digits as its factorization.

12942509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 12942509 is about 3597.5698742346. The cubic root of 12942509 is about 234.7863396770.

The spelling of 12942509 in words is "twelve million, nine hundred forty-two thousand, five hundred nine".