33143381 has 2 divisors, whose sum is σ = 33143382. Its totient is φ = 33143380.

The previous prime is 33143377. The next prime is 33143401. The reversal of 33143381 is 18334133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31820881 + 1322500 = 5641^2 + 1150^2 .

It is an emirp because it is prime and its reverse (18334133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33143381 - 2² = 33143377 is a prime.

It is a super-2 number, since 2×33143381² = 2196967408222322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33143381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33143351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16571690 + 16571691.

It is an arithmetic number, because the mean of its divisors is an integer number (16571691).

Almost surely, 2^33143381 is an apocalyptic number.

It is an amenable number.

33143381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33143381 is an equidigital number, since it uses as much as digits as its factorization.

33143381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 33143381 is about 5757.0288343902. The cubic root of 33143381 is about 321.2173067508.

The spelling of 33143381 in words is "thirty-three million, one hundred forty-three thousand, three hundred eighty-one".