133031228 has 12 divisors (see below), whose sum is σ = 253968792. Its totient is φ = 60468720.

The previous prime is 133031221. The next prime is 133031257. The reversal of 133031228 is 822130331.

133031228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511675 + ... + 1511762.

It is an arithmetic number, because the mean of its divisors is an integer number (21164066).

Almost surely, 2^133031228 is an apocalyptic number.

It is an amenable number.

133031228 is a deficient number, since it is larger than the sum of its proper divisors (120937564).

133031228 is a wasteful number, since it uses less digits than its factorization.

133031228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023452 (or 3023450 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 133031228 is about 11533.9164207133. The cubic root of 133031228 is about 510.4868195373.

Adding to 133031228 its reverse (822130331), we get a palindrome (955161559).

The spelling of 133031228 in words is "one hundred thirty-three million, thirty-one thousand, two hundred twenty-eight".