12686271991 has 2 divisors, whose sum is σ = 12686271992. Its totient is φ = 12686271990.

The previous prime is 12686271929. The next prime is 12686272043. The reversal of 12686271991 is 19917268621.

It is an a-pointer prime, because the next prime (12686272043) can be obtained adding 12686271991 to its sum of digits (52).

It is a strong prime.

It is an emirp because it is prime and its reverse (19917268621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12686271991 is a prime.

It is a super-2 number, since 2×12686271991² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12686271901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6343135995 + 6343135996.

It is an arithmetic number, because the mean of its divisors is an integer number (6343135996).

Almost surely, 2^12686271991 is an apocalyptic number.

12686271991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12686271991 is an equidigital number, since it uses as much as digits as its factorization.

12686271991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The spelling of 12686271991 in words is "twelve billion, six hundred eighty-six million, two hundred seventy-one thousand, nine hundred ninety-one".