12861817 has 2 divisors, whose sum is σ = 12861818. Its totient is φ = 12861816.

The previous prime is 12861791. The next prime is 12861847. The reversal of 12861817 is 71816821.

12861817 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11363641 + 1498176 = 3371^2 + 1224^2 .

It is an emirp because it is prime and its reverse (71816821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12861817 is a prime.

It is equal to p₈₄₀₈₈₆ and since 12861817 and 840886 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 (12861847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6430908 + 6430909.

It is an arithmetic number, because the mean of its divisors is an integer number (6430909).

Almost surely, 2^12861817 is an apocalyptic number.

It is an amenable number.

12861817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12861817 is an equidigital number, since it uses as much as digits as its factorization.

12861817 is an evil number, because the sum of its binary digits is even.

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

The square root of 12861817 is about 3586.3375468575. The cubic root of 12861817 is about 234.2973853106.

The spelling of 12861817 in words is "twelve million, eight hundred sixty-one thousand, eight hundred seventeen".