33997681 has 2 divisors, whose sum is σ = 33997682. Its totient is φ = 33997680.

The previous prime is 33997673. The next prime is 33997687. The reversal of 33997681 is 18679933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23853456 + 10144225 = 4884^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 33997681 - 2³ = 33997673 is a prime.

It is a super-2 number, since 2×33997681² = 2311684626755522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33997687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16998840 + 16998841.

It is an arithmetic number, because the mean of its divisors is an integer number (16998841).

Almost surely, 2^33997681 is an apocalyptic number.

It is an amenable number.

33997681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33997681 is an equidigital number, since it uses as much as digits as its factorization.

33997681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 33997681 is about 5830.7530388450. The cubic root of 33997681 is about 323.9538146076.

The spelling of 33997681 in words is "thirty-three million, nine hundred ninety-seven thousand, six hundred eighty-one".