12517909 has 2 divisors, whose sum is σ = 12517910. Its totient is φ = 12517908.

The previous prime is 12517889. The next prime is 12517913. The reversal of 12517909 is 90971521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7273809 + 5244100 = 2697^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 12517909 - 2¹⁵ = 12485141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12517919) 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, 6258954 + 6258955.

It is an arithmetic number, because the mean of its divisors is an integer number (6258955).

Almost surely, 2^12517909 is an apocalyptic number.

It is an amenable number.

12517909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12517909 is an equidigital number, since it uses as much as digits as its factorization.

12517909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 12517909 is about 3538.0657144830. The cubic root of 12517909 is about 232.1902237435.

The spelling of 12517909 in words is "twelve million, five hundred seventeen thousand, nine hundred nine".