12918731687 has 2 divisors, whose sum is σ = 12918731688. Its totient is φ = 12918731686.

The previous prime is 12918731659. The next prime is 12918731689. The reversal of 12918731687 is 78613781921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12918731687 is a prime.

Together with 12918731689, 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 (12918731689) 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, 6459365843 + 6459365844.

It is an arithmetic number, because the mean of its divisors is an integer number (6459365844).

Almost surely, 2^12918731687 is an apocalyptic number.

12918731687 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918731687 is an equidigital number, since it uses as much as digits as its factorization.

12918731687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The spelling of 12918731687 in words is "twelve billion, nine hundred eighteen million, seven hundred thirty-one thousand, six hundred eighty-seven".