33216161 has 16 divisors (see below), whose sum is σ = 38538240. Its totient is φ = 28311120.

The previous prime is 33216149. The next prime is 33216179. The reversal of 33216161 is 16161233.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 33216161 - 2¹⁰ = 33215137 is a prime.

It is a super-2 number, since 2×33216161² = 2206626703155842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (33216361) 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, 20756 + ... + 22298.

It is an arithmetic number, because the mean of its divisors is an integer number (2408640).

Almost surely, 2^33216161 is an apocalyptic number.

It is an amenable number.

33216161 is a deficient number, since it is larger than the sum of its proper divisors (5322079).

33216161 is a wasteful number, since it uses less digits than its factorization.

33216161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676.

The product of its digits is 648, while the sum is 23.

The square root of 33216161 is about 5763.3463369817. The cubic root of 33216161 is about 321.4522566721.

Adding to 33216161 its reverse (16161233), we get a palindrome (49377394).

The spelling of 33216161 in words is "thirty-three million, two hundred sixteen thousand, one hundred sixty-one".