12143891 has 2 divisors, whose sum is σ = 12143892. Its totient is φ = 12143890.

The previous prime is 12143863. The next prime is 12143927. The reversal of 12143891 is 19834121.

12143891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12143891 - 2¹⁸ = 11881747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12143851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6071945 + 6071946.

It is an arithmetic number, because the mean of its divisors is an integer number (6071946).

Almost surely, 2^12143891 is an apocalyptic number.

12143891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12143891 is an equidigital number, since it uses as much as digits as its factorization.

12143891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 12143891 is about 3484.8086030656. The cubic root of 12143891 is about 229.8542933466.

The spelling of 12143891 in words is "twelve million, one hundred forty-three thousand, eight hundred ninety-one".