133731912 has 64 divisors (see below), whose sum is σ = 348238080. Its totient is φ = 42757632.

The previous prime is 133731907. The next prime is 133731919. The reversal of 133731912 is 219137331.

It is a self number, because there is not a number n which added to its sum of digits gives 133731912.

It is not an unprimeable number, because it can be changed into a prime (133731919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63793 + ... + 65855.

It is an arithmetic number, because the mean of its divisors is an integer number (5441220).

Almost surely, 2^133731912 is an apocalyptic number.

133731912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133731912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174119040).

133731912 is an abundant number, since it is smaller than the sum of its proper divisors (214506168).

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

133731912 is a wasteful number, since it uses less digits than its factorization.

133731912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182 (or 2178 counting only the distinct ones).

The product of its digits is 3402, while the sum is 30.

The square root of 133731912 is about 11564.2514673454. The cubic root of 133731912 is about 511.3815061740.

It can be divided in two parts, 1337319 and 12, that added together give a palindrome (1337331).

The spelling of 133731912 in words is "one hundred thirty-three million, seven hundred thirty-one thousand, nine hundred twelve".