133681312 has 24 divisors (see below), whose sum is σ = 265114836. Its totient is φ = 66350592.

The previous prime is 133681297. The next prime is 133681337. The reversal of 133681312 is 213186331.

133681312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 127148176 + 6533136 = 11276^2 + 2556^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10863 + ... + 19630.

Almost surely, 2^133681312 is an apocalyptic number.

It is an amenable number.

133681312 is a deficient number, since it is larger than the sum of its proper divisors (131433524).

133681312 is a wasteful number, since it uses less digits than its factorization.

133681312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30640 (or 30632 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 133681312 is about 11562.0634836520. The cubic root of 133681312 is about 511.3170010805.

The spelling of 133681312 in words is "one hundred thirty-three million, six hundred eighty-one thousand, three hundred twelve".