33220981 has 2 divisors, whose sum is σ = 33220982. Its totient is φ = 33220980.

The previous prime is 33220973. The next prime is 33221003. The reversal of 33220981 is 18902233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 342225 = 5734^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 33220981 - 2³ = 33220973 is a prime.

It is a super-2 number, since 2×33220981² = 2207267157204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33220181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610490 + 16610491.

It is an arithmetic number, because the mean of its divisors is an integer number (16610491).

Almost surely, 2^33220981 is an apocalyptic number.

It is an amenable number.

33220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33220981 is an equidigital number, since it uses as much as digits as its factorization.

33220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 33220981 is about 5763.7644816561. The cubic root of 33220981 is about 321.4678045750.

The spelling of 33220981 in words is "thirty-three million, two hundred twenty thousand, nine hundred eighty-one".