33161231 has 2 divisors, whose sum is σ = 33161232. Its totient is φ = 33161230.

The previous prime is 33161201. The next prime is 33161243. The reversal of 33161231 is 13216133.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 33161231 - 2¹⁰ = 33160207 is a prime.

It is a super-3 number, since 3×33161231³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33161201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16580615 + 16580616.

It is an arithmetic number, because the mean of its divisors is an integer number (16580616).

It is a self-describing number.

Almost surely, 2^33161231 is an apocalyptic number.

33161231 is a deficient number, since it is larger than the sum of its proper divisors (1).

33161231 is an equidigital number, since it uses as much as digits as its factorization.

33161231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 33161231 is about 5758.5789045562. The cubic root of 33161231 is about 321.2749623040.

Adding to 33161231 its reverse (13216133), we get a palindrome (46377364).

The spelling of 33161231 in words is "thirty-three million, one hundred sixty-one thousand, two hundred thirty-one".