12811155 has 16 divisors (see below), whose sum is σ = 23426304. Its totient is φ = 5856480.

The previous prime is 12811151. The next prime is 12811157. The reversal of 12811155 is 55111821.

It is not a de Polignac number, because 12811155 - 2² = 12811151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12811151) 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, 60901 + ... + 61110.

It is an arithmetic number, because the mean of its divisors is an integer number (1464144).

Almost surely, 2^12811155 is an apocalyptic number.

12811155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12811155 is a deficient number, since it is larger than the sum of its proper divisors (10615149).

12811155 is a wasteful number, since it uses less digits than its factorization.

12811155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122026.

The product of its digits is 400, while the sum is 24.

The square root of 12811155 is about 3579.2673831386. The cubic root of 12811155 is about 233.9893522805.

Adding to 12811155 its reverse (55111821), we get a palindrome (67922976).

The spelling of 12811155 in words is "twelve million, eight hundred eleven thousand, one hundred fifty-five".