33928981 has 2 divisors, whose sum is σ = 33928982. Its totient is φ = 33928980.

The previous prime is 33928967. The next prime is 33928997. The reversal of 33928981 is 18982933.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 7612081 = 5130^2 + 2759^2 .

It is an emirp because it is prime and its reverse (18982933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33928981 - 2¹¹ = 33926933 is a prime.

It is a super-2 number, since 2×33928981² = 2302351503396722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33928931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16964490 + 16964491.

It is an arithmetic number, because the mean of its divisors is an integer number (16964491).

Almost surely, 2^33928981 is an apocalyptic number.

It is an amenable number.

33928981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33928981 is an equidigital number, since it uses as much as digits as its factorization.

33928981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 33928981 is about 5824.8588824108. The cubic root of 33928981 is about 323.7354601581.

The spelling of 33928981 in words is "thirty-three million, nine hundred twenty-eight thousand, nine hundred eighty-one".