9131228 has 6 divisors (see below), whose sum is σ = 15979656. Its totient is φ = 4565612.

The previous prime is 9131219. The next prime is 9131231. The reversal of 9131228 is 8221319.

9131228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9131197 and 9131206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1141400 + ... + 1141407.

It is an arithmetic number, because the mean of its divisors is an integer number (2663276).

Almost surely, 2^9131228 is an apocalyptic number.

It is an amenable number.

9131228 is a deficient number, since it is larger than the sum of its proper divisors (6848428).

9131228 is a wasteful number, since it uses less digits than its factorization.

9131228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282811 (or 2282809 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 9131228 is about 3021.7921834567. The cubic root of 9131228 is about 209.0144904218.

Subtracting from 9131228 its reverse (8221319), we obtain a palindrome (909909).

The spelling of 9131228 in words is "nine million, one hundred thirty-one thousand, two hundred twenty-eight".