12911287 has 2 divisors, whose sum is σ = 12911288. Its totient is φ = 12911286.

The previous prime is 12911281. The next prime is 12911329. The reversal of 12911287 is 78211921.

It is a weak prime.

It is an emirp because it is prime and its reverse (78211921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12911287 - 2¹⁵ = 12878519 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12911281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455643 + 6455644.

It is an arithmetic number, because the mean of its divisors is an integer number (6455644).

Almost surely, 2^12911287 is an apocalyptic number.

12911287 is a deficient number, since it is larger than the sum of its proper divisors (1).

12911287 is an equidigital number, since it uses as much as digits as its factorization.

12911287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The square root of 12911287 is about 3593.2279359929. The cubic root of 12911287 is about 234.5973912124.

The spelling of 12911287 in words is "twelve million, nine hundred eleven thousand, two hundred eighty-seven".