12129191 has 4 divisors (see below), whose sum is σ = 12249384. Its totient is φ = 12009000.

The previous prime is 12129167. The next prime is 12129197. The reversal of 12129191 is 19192121.

12129191 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 a cyclic number.

It is not a de Polignac number, because 12129191 - 2⁶ = 12129127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12129191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129197) 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 3 ways as a sum of consecutive naturals, for example, 59945 + ... + 60146.

It is an arithmetic number, because the mean of its divisors is an integer number (3062346).

Almost surely, 2^12129191 is an apocalyptic number.

12129191 is a deficient number, since it is larger than the sum of its proper divisors (120193).

12129191 is a wasteful number, since it uses less digits than its factorization.

12129191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120192.

The product of its digits is 324, while the sum is 26.

The square root of 12129191 is about 3482.6988098312. The cubic root of 12129191 is about 229.7615108278.

The spelling of 12129191 in words is "twelve million, one hundred twenty-nine thousand, one hundred ninety-one".