12811867 has 2 divisors, whose sum is σ = 12811868. Its totient is φ = 12811866.

The previous prime is 12811853. The next prime is 12811873. The reversal of 12811867 is 76811821.

It is a strong prime.

It is an emirp because it is prime and its reverse (76811821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12811867 - 2²³ = 4423259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12811847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6405933 + 6405934.

It is an arithmetic number, because the mean of its divisors is an integer number (6405934).

Almost surely, 2^12811867 is an apocalyptic number.

12811867 is a deficient number, since it is larger than the sum of its proper divisors (1).

12811867 is an equidigital number, since it uses as much as digits as its factorization.

12811867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 34.

The square root of 12811867 is about 3579.3668434515. The cubic root of 12811867 is about 233.9936869751.

The spelling of 12811867 in words is "twelve million, eight hundred eleven thousand, eight hundred sixty-seven".