12166491 has 4 divisors (see below), whose sum is σ = 16221992. Its totient is φ = 8110992.

The previous prime is 12166481. The next prime is 12166493. The reversal of 12166491 is 19466121.

It is a happy number.

12166491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12166491 - 2⁵ = 12166459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12166493) 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, 2027746 + ... + 2027751.

It is an arithmetic number, because the mean of its divisors is an integer number (4055498).

Almost surely, 2^12166491 is an apocalyptic number.

12166491 is a deficient number, since it is larger than the sum of its proper divisors (4055501).

12166491 is an equidigital number, since it uses as much as digits as its factorization.

12166491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055500.

The product of its digits is 2592, while the sum is 30.

The square root of 12166491 is about 3488.0497416178. The cubic root of 12166491 is about 229.9967926459.

The spelling of 12166491 in words is "twelve million, one hundred sixty-six thousand, four hundred ninety-one".