12865681 has 2 divisors, whose sum is σ = 12865682. Its totient is φ = 12865680.

The previous prime is 12865667. The next prime is 12865687. The reversal of 12865681 is 18656821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 13456 = 3585^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 12865681 - 2⁷ = 12865553 is a prime.

It is a super-2 number, since 2×12865681² = 331051495187522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12865681.

It is not a weakly prime, because it can be changed into another prime (12865687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6432840 + 6432841.

It is an arithmetic number, because the mean of its divisors is an integer number (6432841).

Almost surely, 2^12865681 is an apocalyptic number.

It is an amenable number.

12865681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12865681 is an equidigital number, since it uses as much as digits as its factorization.

12865681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 12865681 is about 3586.8762175464. The cubic root of 12865681 is about 234.3208458230.

It can be divided in two parts, 1 and 2865681, that added together give a palindrome (2865682).

The spelling of 12865681 in words is "twelve million, eight hundred sixty-five thousand, six hundred eighty-one".