12159891 has 6 divisors (see below), whose sum is σ = 17564300. Its totient is φ = 8106588.

The previous prime is 12159881. The next prime is 12159899. The reversal of 12159891 is 19895121.

12159891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12159891 - 2⁶ = 12159827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12159899) 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 in 5 ways as a sum of consecutive naturals, for example, 675541 + ... + 675558.

Almost surely, 2^12159891 is an apocalyptic number.

12159891 is a deficient number, since it is larger than the sum of its proper divisors (5404409).

12159891 is a wasteful number, since it uses less digits than its factorization.

12159891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351105 (or 1351102 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 12159891 is about 3487.1035258506. The cubic root of 12159891 is about 229.9551960617.

The spelling of 12159891 in words is "twelve million, one hundred fifty-nine thousand, eight hundred ninety-one".