13666231 has 2 divisors, whose sum is σ = 13666232. Its totient is φ = 13666230.

The previous prime is 13666223. The next prime is 13666253. The reversal of 13666231 is 13266631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13666231 - 2³ = 13666223 is a prime.

It is a super-2 number, since 2×13666231² = 373531739490722, 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 13666231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13666271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833115 + 6833116.

It is an arithmetic number, because the mean of its divisors is an integer number (6833116).

Almost surely, 2^13666231 is an apocalyptic number.

13666231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13666231 is an equidigital number, since it uses as much as digits as its factorization.

13666231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 13666231 is about 3696.7865775562. The cubic root of 13666231 is about 239.0834894439.

The spelling of 13666231 in words is "thirteen million, six hundred sixty-six thousand, two hundred thirty-one".