33312161 has 4 divisors (see below), whose sum is σ = 33858324. Its totient is φ = 32766000.

The previous prime is 33312151. The next prime is 33312179. The reversal of 33312161 is 16121333.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16121333 = 31 ⋅520043.

It can be written as a sum of positive squares in 2 ways, for example, as 2119936 + 31192225 = 1456^2 + 5585^2 .

It is a cyclic number.

It is not a de Polignac number, because 33312161 - 2¹⁴ = 33295777 is a prime.

It is a super-2 number, since 2×33312161² = 2219400140979842, 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 (33312151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272990 + ... + 273111.

It is an arithmetic number, because the mean of its divisors is an integer number (8464581).

Almost surely, 2^33312161 is an apocalyptic number.

It is an amenable number.

33312161 is a deficient number, since it is larger than the sum of its proper divisors (546163).

33312161 is an equidigital number, since it uses as much as digits as its factorization.

33312161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546162.

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

The square root of 33312161 is about 5771.6688227929. The cubic root of 33312161 is about 321.7616415599.

Adding to 33312161 its reverse (16121333), we get a palindrome (49433494).

The spelling of 33312161 in words is "thirty-three million, three hundred twelve thousand, one hundred sixty-one".