33320981 has 2 divisors, whose sum is σ = 33320982. Its totient is φ = 33320980.

The previous prime is 33320957. The next prime is 33320983. The reversal of 33320981 is 18902333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 442225 = 5734^2 + 665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33320981 is a prime.

It is a super-2 number, since 2×33320981² = 2220575549604722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 33320983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33320983) 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, 16660490 + 16660491.

It is an arithmetic number, because the mean of its divisors is an integer number (16660491).

Almost surely, 2^33320981 is an apocalyptic number.

It is an amenable number.

33320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33320981 is an equidigital number, since it uses as much as digits as its factorization.

33320981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 33320981 is about 5772.4328493279. The cubic root of 33320981 is about 321.7900364680.

The spelling of 33320981 in words is "thirty-three million, three hundred twenty thousand, nine hundred eighty-one".