33138891 has 12 divisors (see below), whose sum is σ = 48075768. Its totient is φ = 21996384.

The previous prime is 33138887. The next prime is 33138893. The reversal of 33138891 is 19883133.

It is not a de Polignac number, because 33138891 - 2² = 33138887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (33138893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5805 + ... + 9998.

It is an arithmetic number, because the mean of its divisors is an integer number (4006314).

Almost surely, 2^33138891 is an apocalyptic number.

33138891 is a deficient number, since it is larger than the sum of its proper divisors (14936877).

33138891 is a wasteful number, since it uses less digits than its factorization.

33138891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16042 (or 16039 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 33138891 is about 5756.6388630867. The cubic root of 33138891 is about 321.2028007791.

The spelling of 33138891 in words is "thirty-three million, one hundred thirty-eight thousand, eight hundred ninety-one".