133431312 has 60 divisors (see below), whose sum is σ = 400981776. Its totient is φ = 38122560.

The previous prime is 133431307. The next prime is 133431367. The reversal of 133431312 is 213134331.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26014 + ... + 30717.

Almost surely, 2^133431312 is an apocalyptic number.

133431312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133431312 is an abundant number, since it is smaller than the sum of its proper divisors (267550464).

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

133431312 is a wasteful number, since it uses less digits than its factorization.

133431312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56756 (or 56743 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 133431312 is about 11551.2472053887. The cubic root of 133431312 is about 510.9980609171.

Adding to 133431312 its reverse (213134331), we get a palindrome (346565643).

The spelling of 133431312 in words is "one hundred thirty-three million, four hundred thirty-one thousand, three hundred twelve".