12691199 has 2 divisors, whose sum is σ = 12691200. Its totient is φ = 12691198.

The previous prime is 12691187. The next prime is 12691213. The reversal of 12691199 is 99119621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12691199 - 2⁸ = 12690943 is a prime.

It is a super-2 number, since 2×12691199² = 322133064115202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12691109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345599 + 6345600.

It is an arithmetic number, because the mean of its divisors is an integer number (6345600).

Almost surely, 2^12691199 is an apocalyptic number.

12691199 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691199 is an equidigital number, since it uses as much as digits as its factorization.

12691199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 38.

The square root of 12691199 is about 3562.4709121620. The cubic root of 12691199 is about 233.2567487891.

The spelling of 12691199 in words is "twelve million, six hundred ninety-one thousand, one hundred ninety-nine".