12809169 has 18 divisors (see below), whose sum is σ = 19131138. Its totient is φ = 8258400.

The previous prime is 12809149. The next prime is 12809191. The reversal of 12809169 is 96190821.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 2214144 = 3255^2 + 1488^2 .

It is not a de Polignac number, because 12809169 - 2¹² = 12805073 is a prime.

It is a super-2 number, since 2×12809169² = 328149620941122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12809119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7909 + ... + 9389.

It is an arithmetic number, because the mean of its divisors is an integer number (1062841).

Almost surely, 2^12809169 is an apocalyptic number.

It is an amenable number.

12809169 is a deficient number, since it is larger than the sum of its proper divisors (6321969).

12809169 is a wasteful number, since it uses less digits than its factorization.

12809169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12809169 is about 3578.9899413103. The cubic root of 12809169 is about 233.9772605560.

The spelling of 12809169 in words is "twelve million, eight hundred nine thousand, one hundred sixty-nine".