33131216 has 20 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 16542432.

The previous prime is 33131191. The next prime is 33131221. The reversal of 33131216 is 61213133.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19655 + ... + 21273.

It is an arithmetic number, because the mean of its divisors is an integer number (3214080).

Almost surely, 2^33131216 is an apocalyptic number.

It is an amenable number.

33131216 is a deficient number, since it is larger than the sum of its proper divisors (31150384).

33131216 is a wasteful number, since it uses less digits than its factorization.

33131216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2900 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 33131216 is about 5755.9722028516. The cubic root of 33131216 is about 321.1780019022.

Adding to 33131216 its reverse (61213133), we get a palindrome (94344349).

The spelling of 33131216 in words is "thirty-three million, one hundred thirty-one thousand, two hundred sixteen".