33730981 has 2 divisors, whose sum is σ = 33730982. Its totient is φ = 33730980.

The previous prime is 33730967. The next prime is 33730999. The reversal of 33730981 is 18903733.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 8820900 = 4991^2 + 2970^2 .

It is an emirp because it is prime and its reverse (18903733) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33730981 - 2⁹ = 33730469 is a prime.

It is a super-2 number, since 2×33730981² = 2275558158444722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33730901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16865490 + 16865491.

It is an arithmetic number, because the mean of its divisors is an integer number (16865491).

Almost surely, 2^33730981 is an apocalyptic number.

It is an amenable number.

33730981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33730981 is an equidigital number, since it uses as much as digits as its factorization.

33730981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 33730981 is about 5807.8378937432. The cubic root of 33730981 is about 323.1044881083.

The spelling of 33730981 in words is "thirty-three million, seven hundred thirty thousand, nine hundred eighty-one".