12811171 has 4 divisors (see below), whose sum is σ = 12841192. Its totient is φ = 12781152.

The previous prime is 12811163. The next prime is 12811177. The reversal of 12811171 is 17111821.

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 12811171 - 2³ = 12811163 is a prime.

It is a super-2 number, since 2×12811171² = 328252204782482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12811177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14361 + ... + 15226.

It is an arithmetic number, because the mean of its divisors is an integer number (3210298).

Almost surely, 2^12811171 is an apocalyptic number.

12811171 is a deficient number, since it is larger than the sum of its proper divisors (30021).

12811171 is an equidigital number, since it uses as much as digits as its factorization.

12811171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30020.

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

The square root of 12811171 is about 3579.2696182322. The cubic root of 12811171 is about 233.9894496911.

Adding to 12811171 its reverse (17111821), we get a palindrome (29922992).

It can be divided in two parts, 1281 and 1171, that multiplied together give a palindrome (1500051).

The spelling of 12811171 in words is "twelve million, eight hundred eleven thousand, one hundred seventy-one".