12816609 has 16 divisors (see below), whose sum is σ = 18998784. Its totient is φ = 7632000.

The previous prime is 12816607. The next prime is 12816667. The reversal of 12816609 is 90661821.

It is not a de Polignac number, because 12816609 - 2¹ = 12816607 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12816609.

It is not an unprimeable number, because it can be changed into a prime (12816607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4092 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^12816609 is an apocalyptic number.

It is an amenable number.

12816609 is a deficient number, since it is larger than the sum of its proper divisors (6182175).

12816609 is a wasteful number, since it uses less digits than its factorization.

12816609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10648.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 12816609 is about 3580.0291898251. The cubic root of 12816609 is about 234.0225524323.

The spelling of 12816609 in words is "twelve million, eight hundred sixteen thousand, six hundred nine".