12811161 has 16 divisors (see below), whose sum is σ = 19445760. Its totient is φ = 7426320.

The previous prime is 12811157. The next prime is 12811163. The reversal of 12811161 is 16111821.

It is a happy number.

It is not a de Polignac number, because 12811161 - 2² = 12811157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12811163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7681 + ... + 9198.

It is an arithmetic number, because the mean of its divisors is an integer number (1215360).

Almost surely, 2^12811161 is an apocalyptic number.

12811161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12811161 is a deficient number, since it is larger than the sum of its proper divisors (6634599).

12811161 is a wasteful number, since it uses less digits than its factorization.

12811161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16916.

The product of its digits is 96, while the sum is 21.

The square root of 12811161 is about 3579.2682212989. The cubic root of 12811161 is about 233.9893888095.

Adding to 12811161 its reverse (16111821), we get a palindrome (28922982).

It can be divided in two parts, 1281 and 1161, that added together give a palindrome (2442).

The spelling of 12811161 in words is "twelve million, eight hundred eleven thousand, one hundred sixty-one".