11812171 has 4 divisors (see below), whose sum is σ = 13499632. Its totient is φ = 10124712.

The previous prime is 11812123. The next prime is 11812183. The reversal of 11812171 is 17121811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17121811 = 7 ⋅2445973.

It is a cyclic number.

It is not a de Polignac number, because 11812171 - 2⁹ = 11811659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11812771) 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, 843720 + ... + 843733.

It is an arithmetic number, because the mean of its divisors is an integer number (3374908).

Almost surely, 2^11812171 is an apocalyptic number.

11812171 is a deficient number, since it is larger than the sum of its proper divisors (1687461).

11812171 is an equidigital number, since it uses as much as digits as its factorization.

11812171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687460.

The product of its digits is 112, while the sum is 22.

The square root of 11812171 is about 3436.8839084264. The cubic root of 11812171 is about 227.7420585054.

Adding to 11812171 its reverse (17121811), we get a palindrome (28933982).

The spelling of 11812171 in words is "eleven million, eight hundred twelve thousand, one hundred seventy-one".