33998981 has 2 divisors, whose sum is σ = 33998982. Its totient is φ = 33998980.

The previous prime is 33998977. The next prime is 33999019. The reversal of 33998981 is 18989933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 2076481 = 5650^2 + 1441^2 .

It is an emirp because it is prime and its reverse (18989933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33998981 - 2² = 33998977 is a prime.

It is a super-2 number, since 2×33998981² = 2311861418076722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33994981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16999490 + 16999491.

It is an arithmetic number, because the mean of its divisors is an integer number (16999491).

Almost surely, 2^33998981 is an apocalyptic number.

It is an amenable number.

33998981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33998981 is an equidigital number, since it uses as much as digits as its factorization.

33998981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 33998981 is about 5830.8645156615. The cubic root of 33998981 is about 323.9579436597.

The spelling of 33998981 in words is "thirty-three million, nine hundred ninety-eight thousand, nine hundred eighty-one".