13000861 has 2 divisors, whose sum is σ = 13000862. Its totient is φ = 13000860.

The previous prime is 13000849. The next prime is 13000877. The reversal of 13000861 is 16800031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12467961 + 532900 = 3531^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 13000861 - 2⁵ = 13000829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13000831) 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, 6500430 + 6500431.

It is an arithmetic number, because the mean of its divisors is an integer number (6500431).

Almost surely, 2^13000861 is an apocalyptic number.

It is an amenable number.

13000861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13000861 is an equidigital number, since it uses as much as digits as its factorization.

13000861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 13000861 is about 3605.6706727043. The cubic root of 13000861 is about 235.1386596810.

Adding to 13000861 its reverse (16800031), we get a palindrome (29800892).

It can be divided in two parts, 13000 and 861, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 13000861 in words is "thirteen million, eight hundred sixty-one", and thus it is an aban number.