133831312 has 10 divisors (see below), whose sum is σ = 259298198. Its totient is φ = 66915648.

The previous prime is 133831297. The next prime is 133831333. The reversal of 133831312 is 213138331.

It can be written as a sum of positive squares in only one way, i.e., 106832896 + 26998416 = 10336^2 + 5196^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182213 + ... + 4182244.

Almost surely, 2^133831312 is an apocalyptic number.

It is an amenable number.

133831312 is a deficient number, since it is larger than the sum of its proper divisors (125466886).

133831312 is an equidigital number, since it uses as much as digits as its factorization.

133831312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8364465 (or 8364459 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 133831312 is about 11568.5483964065. The cubic root of 133831312 is about 511.5081743522.

Adding to 133831312 its reverse (213138331), we get a palindrome (346969643).

The spelling of 133831312 in words is "one hundred thirty-three million, eight hundred thirty-one thousand, three hundred twelve".