12869861 has 2 divisors, whose sum is σ = 12869862. Its totient is φ = 12869860.

The previous prime is 12869851. The next prime is 12869873. The reversal of 12869861 is 16896821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10562500 + 2307361 = 3250^2 + 1519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12869861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12869851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6434930 + 6434931.

It is an arithmetic number, because the mean of its divisors is an integer number (6434931).

Almost surely, 2^12869861 is an apocalyptic number.

It is an amenable number.

12869861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12869861 is an equidigital number, since it uses as much as digits as its factorization.

12869861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 12869861 is about 3587.4588499382. The cubic root of 12869861 is about 234.3462196601.

The spelling of 12869861 in words is "twelve million, eight hundred sixty-nine thousand, eight hundred sixty-one".