12866681 has 2 divisors, whose sum is σ = 12866682. Its totient is φ = 12866680.

The previous prime is 12866647. The next prime is 12866717. The reversal of 12866681 is 18666821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9554281 + 3312400 = 3091^2 + 1820^2 .

It is an emirp because it is prime and its reverse (18666821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12866681 - 2⁶ = 12866617 is a prime.

It is a super-2 number, since 2×12866681² = 331102959911522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12866611) 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, 6433340 + 6433341.

It is an arithmetic number, because the mean of its divisors is an integer number (6433341).

Almost surely, 2^12866681 is an apocalyptic number.

It is an amenable number.

12866681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12866681 is an equidigital number, since it uses as much as digits as its factorization.

12866681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 12866681 is about 3587.0156118980. The cubic root of 12866681 is about 234.3269166191.

It can be divided in two parts, 1 and 2866681, that added together give a palindrome (2866682).

The spelling of 12866681 in words is "twelve million, eight hundred sixty-six thousand, six hundred eighty-one".