12861217 has 2 divisors, whose sum is σ = 12861218. Its totient is φ = 12861216.

The previous prime is 12861203. The next prime is 12861223. The reversal of 12861217 is 71216821.

12861217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 73441 = 3576^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861217 - 2²³ = 4472609 is a prime.

It is equal to p₈₄₀₈₄₄ and since 12861217 and 840844 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12861227) 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, 6430608 + 6430609.

It is an arithmetic number, because the mean of its divisors is an integer number (6430609).

Almost surely, 2^12861217 is an apocalyptic number.

It is an amenable number.

12861217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12861217 is an equidigital number, since it uses as much as digits as its factorization.

12861217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 12861217 is about 3586.2538950833. The cubic root of 12861217 is about 234.2937419525.

The spelling of 12861217 in words is "twelve million, eight hundred sixty-one thousand, two hundred seventeen".