33042731 has 2 divisors, whose sum is σ = 33042732. Its totient is φ = 33042730.

The previous prime is 33042721. The next prime is 33042749. The reversal of 33042731 is 13724033.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33042731 is a prime.

It is a super-3 number, since 3×33042731³ (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 junction number, because it is equal to n+sod(n) for n = 33042697 and 33042706.

It is not a weakly prime, because it can be changed into another prime (33042721) 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 as a sum of consecutive naturals, namely, 16521365 + 16521366.

It is an arithmetic number, because the mean of its divisors is an integer number (16521366).

Almost surely, 2^33042731 is an apocalyptic number.

33042731 is a deficient number, since it is larger than the sum of its proper divisors (1).

33042731 is an equidigital number, since it uses as much as digits as its factorization.

33042731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 33042731 is about 5748.2806994788. The cubic root of 33042731 is about 320.8918188913.

Adding to 33042731 its reverse (13724033), we get a palindrome (46766764).

The spelling of 33042731 in words is "thirty-three million, forty-two thousand, seven hundred thirty-one".