12809149 has 2 divisors, whose sum is σ = 12809150. Its totient is φ = 12809148.

The previous prime is 12809131. The next prime is 12809191. The reversal of 12809149 is 94190821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8323225 + 4485924 = 2885^2 + 2118^2 .

It is an emirp because it is prime and its reverse (94190821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12809149 - 2⁵ = 12809117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12809119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6404574 + 6404575.

It is an arithmetic number, because the mean of its divisors is an integer number (6404575).

Almost surely, 2^12809149 is an apocalyptic number.

It is an amenable number.

12809149 is a deficient number, since it is larger than the sum of its proper divisors (1).

12809149 is an equidigital number, since it uses as much as digits as its factorization.

12809149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 12809149 is about 3578.9871472248. The cubic root of 12809149 is about 233.9771387801.

The spelling of 12809149 in words is "twelve million, eight hundred nine thousand, one hundred forty-nine".