33630281 has 2 divisors, whose sum is σ = 33630282. Its totient is φ = 33630280.

The previous prime is 33630251. The next prime is 33630283. The reversal of 33630281 is 18203633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 2449225 = 5584^2 + 1565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33630281 is a prime.

It is a super-2 number, since 2×33630281² = 2261991600277922, which contains 22 as substring.

Together with 33630283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33630281.

It is not a weakly prime, because it can be changed into another prime (33630283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16815140 + 16815141.

It is an arithmetic number, because the mean of its divisors is an integer number (16815141).

Almost surely, 2^33630281 is an apocalyptic number.

It is an amenable number.

33630281 is a deficient number, since it is larger than the sum of its proper divisors (1).

33630281 is an equidigital number, since it uses as much as digits as its factorization.

33630281 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 26.

The square root of 33630281 is about 5799.1620946478. The cubic root of 33630281 is about 322.7826370689.

The spelling of 33630281 in words is "thirty-three million, six hundred thirty thousand, two hundred eighty-one".