12685861 has 2 divisors, whose sum is σ = 12685862. Its totient is φ = 12685860.

The previous prime is 12685837. The next prime is 12685873. The reversal of 12685861 is 16858621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 302500 = 3519^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 12685861 - 2⁷ = 12685733 is a prime.

It is a super-2 number, since 2×12685861² = 321862138622642, 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 12685861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12685891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6342930 + 6342931.

It is an arithmetic number, because the mean of its divisors is an integer number (6342931).

Almost surely, 2^12685861 is an apocalyptic number.

It is an amenable number.

12685861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12685861 is an equidigital number, since it uses as much as digits as its factorization.

12685861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12685861 is about 3561.7216342662. The cubic root of 12685861 is about 233.2240411063.

It can be divided in two parts, 1 and 2685861, that added together give a palindrome (2685862).

The spelling of 12685861 in words is "twelve million, six hundred eighty-five thousand, eight hundred sixty-one".