12066891 has 4 divisors (see below), whose sum is σ = 16089192. Its totient is φ = 8044592.

The previous prime is 12066883. The next prime is 12066893. The reversal of 12066891 is 19866021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12066891 - 2³ = 12066883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12066893) 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, 2011146 + ... + 2011151.

It is an arithmetic number, because the mean of its divisors is an integer number (4022298).

Almost surely, 2^12066891 is an apocalyptic number.

12066891 is a deficient number, since it is larger than the sum of its proper divisors (4022301).

12066891 is an equidigital number, since it uses as much as digits as its factorization.

12066891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022300.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 12066891 is about 3473.7430820370. The cubic root of 12066891 is about 229.3674554213.

The spelling of 12066891 in words is "twelve million, sixty-six thousand, eight hundred ninety-one".