13266861 has 4 divisors (see below), whose sum is σ = 17689152. Its totient is φ = 8844572.

The previous prime is 13266839. The next prime is 13266889. The reversal of 13266861 is 16866231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16866231 = 3 ⋅5622077.

It is a cyclic number.

It is not a de Polignac number, because 13266861 - 2⁹ = 13266349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13266061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2211141 + ... + 2211146.

It is an arithmetic number, because the mean of its divisors is an integer number (4422288).

Almost surely, 2^13266861 is an apocalyptic number.

It is an amenable number.

13266861 is a deficient number, since it is larger than the sum of its proper divisors (4422291).

13266861 is an equidigital number, since it uses as much as digits as its factorization.

13266861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422290.

The product of its digits is 10368, while the sum is 33.

The square root of 13266861 is about 3642.3702447719. The cubic root of 13266861 is about 236.7315053012.

The spelling of 13266861 in words is "thirteen million, two hundred sixty-six thousand, eight hundred sixty-one".