12726509 has 2 divisors, whose sum is σ = 12726510. Its totient is φ = 12726508.

The previous prime is 12726503. The next prime is 12726529. The reversal of 12726509 is 90562721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10176100 + 2550409 = 3190^2 + 1597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12726509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12726503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6363254 + 6363255.

It is an arithmetic number, because the mean of its divisors is an integer number (6363255).

Almost surely, 2^12726509 is an apocalyptic number.

It is an amenable number.

12726509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12726509 is an equidigital number, since it uses as much as digits as its factorization.

12726509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 12726509 is about 3567.4232998062. The cubic root of 12726509 is about 233.4728741299.

The spelling of 12726509 in words is "twelve million, seven hundred twenty-six thousand, five hundred nine".