13218047 has 2 divisors, whose sum is σ = 13218048. Its totient is φ = 13218046.

The previous prime is 13218019. The next prime is 13218083. The reversal of 13218047 is 74081231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13218047 - 2¹² = 13213951 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 (13218097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6609023 + 6609024.

It is an arithmetic number, because the mean of its divisors is an integer number (6609024).

Almost surely, 2^13218047 is an apocalyptic number.

13218047 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218047 is an equidigital number, since it uses as much as digits as its factorization.

13218047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 13218047 is about 3635.6632132253. The cubic root of 13218047 is about 236.4408057018.

Adding to 13218047 its reverse (74081231), we get a palindrome (87299278).

The spelling of 13218047 in words is "thirteen million, two hundred eighteen thousand, forty-seven".