131228 has 12 divisors (see below), whose sum is σ = 234360. Its totient is φ = 64272.

The previous prime is 131221. The next prime is 131231. The reversal of 131228 is 822131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221) by changing a digit.

131228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (19530).

2¹³¹²²⁸ is an apocalyptic number.

It is an amenable number.

131228 is a deficient number, since it is larger than the sum of its proper divisors (103132).

131228 is a wasteful number, since it uses less digits than its factorization.

131228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 674 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 131228 is about 362.2540544977. The cubic root of 131228 is about 50.8169782256.

Adding to 131228 its reverse (822131), we get a palindrome (953359).

It can be divided in two parts, 13122 and 8, that multiplied together give a 4-th power (104976 = 18⁴).

The spelling of 131228 in words is "one hundred thirty-one thousand, two hundred twenty-eight".