13218871 has 2 divisors, whose sum is σ = 13218872. Its totient is φ = 13218870.

The previous prime is 13218847. The next prime is 13218893. The reversal of 13218871 is 17881231.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17881231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13218871 - 2⁵ = 13218839 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 (13218371) 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, 6609435 + 6609436.

It is an arithmetic number, because the mean of its divisors is an integer number (6609436).

Almost surely, 2^13218871 is an apocalyptic number.

13218871 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218871 is an equidigital number, since it uses as much as digits as its factorization.

13218871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 31.

The square root of 13218871 is about 3635.7765332869. The cubic root of 13218871 is about 236.4457187618.

The spelling of 13218871 in words is "thirteen million, two hundred eighteen thousand, eight hundred seventy-one".