33616381 has 2 divisors, whose sum is σ = 33616382. Its totient is φ = 33616380.

The previous prime is 33616357. The next prime is 33616391. The reversal of 33616381 is 18361633.

33616381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 9272025 = 4934^2 + 3045^2 .

It is an emirp because it is prime and its reverse (18361633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33616381 - 2¹¹ = 33614333 is a prime.

It is a super-2 number, since 2×33616381² = 2260122143074322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33616391) 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, 16808190 + 16808191.

It is an arithmetic number, because the mean of its divisors is an integer number (16808191).

Almost surely, 2^33616381 is an apocalyptic number.

It is an amenable number.

33616381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33616381 is an equidigital number, since it uses as much as digits as its factorization.

33616381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 33616381 is about 5797.9635217894. The cubic root of 33616381 is about 322.7381603175.

The spelling of 33616381 in words is "thirty-three million, six hundred sixteen thousand, three hundred eighty-one".