12809567 has 4 divisors (see below), whose sum is σ = 12923040. Its totient is φ = 12696096.

The previous prime is 12809557. The next prime is 12809593. The reversal of 12809567 is 76590821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12809567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12809567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12809557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56567 + ... + 56792.

It is an arithmetic number, because the mean of its divisors is an integer number (3230760).

Almost surely, 2^12809567 is an apocalyptic number.

12809567 is a deficient number, since it is larger than the sum of its proper divisors (113473).

12809567 is a wasteful number, since it uses less digits than its factorization.

12809567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113472.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12809567 is about 3579.0455431581. The cubic root of 12809567 is about 233.9796838719.

The spelling of 12809567 in words is "twelve million, eight hundred nine thousand, five hundred sixty-seven".