33935981 has 2 divisors, whose sum is σ = 33935982. Its totient is φ = 33935980.

The previous prime is 33935963. The next prime is 33935983. The reversal of 33935981 is 18953933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 3575881 = 5510^2 + 1891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33935981 is a prime.

It is a super-2 number, since 2×33935981² = 2303301612864722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 33935983, 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 (33935983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16967990 + 16967991.

It is an arithmetic number, because the mean of its divisors is an integer number (16967991).

Almost surely, 2^33935981 is an apocalyptic number.

It is an amenable number.

33935981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33935981 is an equidigital number, since it uses as much as digits as its factorization.

33935981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 33935981 is about 5825.4597243479. The cubic root of 33935981 is about 323.7577222707.

The spelling of 33935981 in words is "thirty-three million, nine hundred thirty-five thousand, nine hundred eighty-one".