33085981 has 2 divisors, whose sum is σ = 33085982. Its totient is φ = 33085980.

The previous prime is 33085951. The next prime is 33085993. The reversal of 33085981 is 18958033.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 5428900 = 5259^2 + 2330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33085981 is a prime.

It is a super-2 number, since 2×33085981² = 2189364277464722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33085981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33085901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16542990 + 16542991.

It is an arithmetic number, because the mean of its divisors is an integer number (16542991).

Almost surely, 2^33085981 is an apocalyptic number.

It is an amenable number.

33085981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33085981 is an equidigital number, since it uses as much as digits as its factorization.

33085981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 33085981 is about 5752.0414636892. The cubic root of 33085981 is about 321.0317641468.

The spelling of 33085981 in words is "thirty-three million, eighty-five thousand, nine hundred eighty-one".