12669509 has 2 divisors, whose sum is σ = 12669510. Its totient is φ = 12669508.

The previous prime is 12669497. The next prime is 12669511. The reversal of 12669509 is 90596621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 5189284 = 2735^2 + 2278^2 .

It is a cyclic number.

It is not a de Polignac number, because 12669509 - 2⁴ = 12669493 is a prime.

Together with 12669511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12669529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334754 + 6334755.

It is an arithmetic number, because the mean of its divisors is an integer number (6334755).

Almost surely, 2^12669509 is an apocalyptic number.

It is an amenable number.

12669509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12669509 is an equidigital number, since it uses as much as digits as its factorization.

12669509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 12669509 is about 3559.4253749728. The cubic root of 12669509 is about 233.1237898818.

The spelling of 12669509 in words is "twelve million, six hundred sixty-nine thousand, five hundred nine".