13131228 has 48 divisors (see below), whose sum is σ = 34513920. Its totient is φ = 3849600.

The previous prime is 13131203. The next prime is 13131233. The reversal of 13131228 is 82213131.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2488 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (719040).

Almost surely, 2^13131228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13131228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17256960).

13131228 is an abundant number, since it is smaller than the sum of its proper divisors (21382692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13131228 is a wasteful number, since it uses less digits than its factorization.

13131228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258 (or 3256 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 13131228 is about 3623.7036302656. The cubic root of 13131228 is about 235.9220033358.

Adding to 13131228 its reverse (82213131), we get a palindrome (95344359).

The spelling of 13131228 in words is "thirteen million, one hundred thirty-one thousand, two hundred twenty-eight".