12891171 has 8 divisors (see below), whose sum is σ = 17355520. Its totient is φ = 8510472.

The previous prime is 12891157. The next prime is 12891173. The reversal of 12891171 is 17119821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12891171 - 2⁹ = 12890659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20551 + ... + 21168.

It is an arithmetic number, because the mean of its divisors is an integer number (2169440).

Almost surely, 2^12891171 is an apocalyptic number.

12891171 is a deficient number, since it is larger than the sum of its proper divisors (4464349).

12891171 is a wasteful number, since it uses less digits than its factorization.

12891171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41825.

The product of its digits is 1008, while the sum is 30.

The square root of 12891171 is about 3590.4276904012. The cubic root of 12891171 is about 234.4754923371.

The spelling of 12891171 in words is "twelve million, eight hundred ninety-one thousand, one hundred seventy-one".