133231312 has 30 divisors (see below), whose sum is σ = 274222838. Its totient is φ = 62694912.

The previous prime is 133231303. The next prime is 133231313. The reversal of 133231312 is 213132331.

It can be written as a sum of positive squares in 3 ways, for example, as 30735936 + 102495376 = 5544^2 + 10124^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 133231312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133231313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9783 + ... + 19030.

Almost surely, 2^133231312 is an apocalyptic number.

It is an amenable number.

133231312 is an abundant number, since it is smaller than the sum of its proper divisors (140991526).

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

133231312 is a wasteful number, since it uses less digits than its factorization.

133231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28855 (or 28832 counting only the distinct ones).

The product of its digits is 324, while the sum is 19.

The square root of 133231312 is about 11542.5868850964. The cubic root of 133231312 is about 510.7426218314.

Adding to 133231312 its reverse (213132331), we get a palindrome (346363643).

The spelling of 133231312 in words is "one hundred thirty-three million, two hundred thirty-one thousand, three hundred twelve".