12999191 has 2 divisors, whose sum is σ = 12999192. Its totient is φ = 12999190.

The previous prime is 12999187. The next prime is 12999193. The reversal of 12999191 is 19199921.

It is a happy number.

12999191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12999191 - 2² = 12999187 is a prime.

Together with 12999193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12999193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6499595 + 6499596.

It is an arithmetic number, because the mean of its divisors is an integer number (6499596).

Almost surely, 2^12999191 is an apocalyptic number.

12999191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12999191 is an equidigital number, since it uses as much as digits as its factorization.

12999191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 41.

The square root of 12999191 is about 3605.4390856039. The cubic root of 12999191 is about 235.1285911587.

The spelling of 12999191 in words is "twelve million, nine hundred ninety-nine thousand, one hundred ninety-one".