12809191 has 2 divisors, whose sum is σ = 12809192. Its totient is φ = 12809190.

The previous prime is 12809149. The next prime is 12809221. The reversal of 12809191 is 19190821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12809191 - 2¹⁷ = 12678119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12809101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6404595 + 6404596.

It is an arithmetic number, because the mean of its divisors is an integer number (6404596).

Almost surely, 2^12809191 is an apocalyptic number.

12809191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12809191 is an equidigital number, since it uses as much as digits as its factorization.

12809191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 12809191 is about 3578.9930148018. The cubic root of 12809191 is about 233.9773945095.

The spelling of 12809191 in words is "twelve million, eight hundred nine thousand, one hundred ninety-one".