33223681 has 2 divisors, whose sum is σ = 33223682. Its totient is φ = 33223680.

The previous prime is 33223679. The next prime is 33223691. The reversal of 33223681 is 18632233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33166081 + 57600 = 5759^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 33223681 - 2¹ = 33223679 is a prime.

It is a super-2 number, since 2×33223681² = 2207625958379522, which contains 22 as substring.

Together with 33223679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33223651) 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, 16611840 + 16611841.

It is an arithmetic number, because the mean of its divisors is an integer number (16611841).

Almost surely, 2^33223681 is an apocalyptic number.

It is an amenable number.

33223681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33223681 is an equidigital number, since it uses as much as digits as its factorization.

33223681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 33223681 is about 5763.9986988201. The cubic root of 33223681 is about 321.4765133240.

The spelling of 33223681 in words is "thirty-three million, two hundred twenty-three thousand, six hundred eighty-one".