12818191 has 2 divisors, whose sum is σ = 12818192. Its totient is φ = 12818190.

The previous prime is 12818189. The next prime is 12818227. The reversal of 12818191 is 19181821.

It is a weak prime.

It is an emirp because it is prime and its reverse (19181821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12818191 - 2¹ = 12818189 is a prime.

Together with 12818189, 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 (12818101) 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 as a sum of consecutive naturals, namely, 6409095 + 6409096.

It is an arithmetic number, because the mean of its divisors is an integer number (6409096).

Almost surely, 2^12818191 is an apocalyptic number.

12818191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12818191 is an equidigital number, since it uses as much as digits as its factorization.

12818191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 31.

The square root of 12818191 is about 3580.2501309266. The cubic root of 12818191 is about 234.0321807837.

The spelling of 12818191 in words is "twelve million, eight hundred eighteen thousand, one hundred ninety-one".