33332381 has 2 divisors, whose sum is σ = 33332382. Its totient is φ = 33332380.

The previous prime is 33332363. The next prime is 33332407. The reversal of 33332381 is 18323333.

It is an a-pointer prime, because the next prime (33332407) can be obtained adding 33332381 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 15405625 = 4234^2 + 3925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33332381 is a prime.

It is a super-2 number, since 2×33332381² = 2222095246258322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_2050883 and since 33332381 and 2050883 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33332381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33332881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16666190 + 16666191.

It is an arithmetic number, because the mean of its divisors is an integer number (16666191).

Almost surely, 2^33332381 is an apocalyptic number.

It is an amenable number.

33332381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33332381 is an equidigital number, since it uses as much as digits as its factorization.

33332381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 26.

The square root of 33332381 is about 5773.4202168212. The cubic root of 33332381 is about 321.8267299469.

The spelling of 33332381 in words is "thirty-three million, three hundred thirty-two thousand, three hundred eighty-one".