33161431 has 4 divisors (see below), whose sum is σ = 33489864. Its totient is φ = 32833000.

The previous prime is 33161419. The next prime is 33161437. The reversal of 33161431 is 13416133.

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: 13416133 = 101 ⋅132833.

It is a cyclic number.

It is not a de Polignac number, because 33161431 - 2⁵ = 33161399 is a prime.

It is a super-2 number, since 2×33161431² = 2199361011935522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33161437) by changing a digit.

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, 164065 + ... + 164266.

It is an arithmetic number, because the mean of its divisors is an integer number (8372466).

It is a self-describing number.

Almost surely, 2^33161431 is an apocalyptic number.

33161431 is a deficient number, since it is larger than the sum of its proper divisors (328433).

33161431 is a wasteful number, since it uses less digits than its factorization.

33161431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328432.

The product of its digits is 648, while the sum is 22.

The square root of 33161431 is about 5758.5962699255. The cubic root of 33161431 is about 321.2756081874.

Adding to 33161431 its reverse (13416133), we get a palindrome (46577564).

The spelling of 33161431 in words is "thirty-three million, one hundred sixty-one thousand, four hundred thirty-one".