12509509 has 2 divisors, whose sum is σ = 12509510. Its totient is φ = 12509508.

The previous prime is 12509507. The next prime is 12509513. The reversal of 12509509 is 90590521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 2712609 = 3130^2 + 1647^2 .

It is a cyclic number.

It is not a de Polignac number, because 12509509 - 2¹ = 12509507 is a prime.

Together with 12509507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12509507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254754 + 6254755.

It is an arithmetic number, because the mean of its divisors is an integer number (6254755).

Almost surely, 2^12509509 is an apocalyptic number.

It is an amenable number.

12509509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509509 is an equidigital number, since it uses as much as digits as its factorization.

12509509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 12509509 is about 3536.8784259570. The cubic root of 12509509 is about 232.1382759220.

The spelling of 12509509 in words is "twelve million, five hundred nine thousand, five hundred nine".