133091688 has 16 divisors (see below), whose sum is σ = 332729280. Its totient is φ = 44363888.

The previous prime is 133091659. The next prime is 133091719. The reversal of 133091688 is 886190331.

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, 2772720 + ... + 2772767.

It is an arithmetic number, because the mean of its divisors is an integer number (20795580).

Almost surely, 2^133091688 is an apocalyptic number.

It is an amenable number.

133091688 is an abundant number, since it is smaller than the sum of its proper divisors (199637592).

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

133091688 is a wasteful number, since it uses less digits than its factorization.

133091688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545496 (or 5545492 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 133091688 is about 11536.5370887455. The cubic root of 133091688 is about 510.5641431328.

The spelling of 133091688 in words is "one hundred thirty-three million, ninety-one thousand, six hundred eighty-eight".