33665213 has 2 divisors, whose sum is σ = 33665214. Its totient is φ = 33665212.

The previous prime is 33665197. The next prime is 33665221. The reversal of 33665213 is 31256633.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23251684 + 10413529 = 4822^2 + 3227^2 .

It is an emirp because it is prime and its reverse (31256633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33665213 - 2⁴ = 33665197 is a prime.

It is a super-2 number, since 2×33665213² = 2266693132670738, which contains 22 as substring.

It is a Sophie Germain 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 (33665273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16832606 + 16832607.

It is an arithmetic number, because the mean of its divisors is an integer number (16832607).

Almost surely, 2^33665213 is an apocalyptic number.

It is an amenable number.

33665213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33665213 is an equidigital number, since it uses as much as digits as its factorization.

33665213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 29.

The square root of 33665213 is about 5802.1731273722. The cubic root of 33665213 is about 322.8943572313.

The spelling of 33665213 in words is "thirty-three million, six hundred sixty-five thousand, two hundred thirteen".