12817509 has 12 divisors (see below), whose sum is σ = 17874528. Its totient is φ = 8154520.

The previous prime is 12817481. The next prime is 12817517. The reversal of 12817509 is 90571821.

It is not a de Polignac number, because 12817509 - 2¹² = 12813413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12817509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12817529) 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 in 11 ways as a sum of consecutive naturals, for example, 29524 + ... + 29954.

It is an arithmetic number, because the mean of its divisors is an integer number (1489544).

Almost surely, 2^12817509 is an apocalyptic number.

It is an amenable number.

12817509 is a deficient number, since it is larger than the sum of its proper divisors (5057019).

12817509 is an frugal number, since it uses more digits than its factorization.

12817509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 12817509 is about 3580.1548849177. The cubic root of 12817509 is about 234.0280300998.

The spelling of 12817509 in words is "twelve million, eight hundred seventeen thousand, five hundred nine".