13166861 has 2 divisors, whose sum is σ = 13166862. Its totient is φ = 13166860.

The previous prime is 13166827. The next prime is 13166887. The reversal of 13166861 is 16866131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6791236 + 6375625 = 2606^2 + 2525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13166861 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 (13166801) 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, 6583430 + 6583431.

It is an arithmetic number, because the mean of its divisors is an integer number (6583431).

Almost surely, 2^13166861 is an apocalyptic number.

It is an amenable number.

13166861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13166861 is an equidigital number, since it uses as much as digits as its factorization.

13166861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 13166861 is about 3628.6169541576. The cubic root of 13166861 is about 236.1352105116.

The spelling of 13166861 in words is "thirteen million, one hundred sixty-six thousand, eight hundred sixty-one".