33981973 has 2 divisors, whose sum is σ = 33981974. Its totient is φ = 33981972.

The previous prime is 33981953. The next prime is 33981977. The reversal of 33981973 is 37918933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22972849 + 11009124 = 4793^2 + 3318^2 .

It is a cyclic number.

It is not a de Polignac number, because 33981973 - 2⁹ = 33981461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33981977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16990986 + 16990987.

It is an arithmetic number, because the mean of its divisors is an integer number (16990987).

Almost surely, 2^33981973 is an apocalyptic number.

It is an amenable number.

33981973 is a deficient number, since it is larger than the sum of its proper divisors (1).

33981973 is an equidigital number, since it uses as much as digits as its factorization.

33981973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 33981973 is about 5829.4058873954. The cubic root of 33981973 is about 323.9039146313.

The spelling of 33981973 in words is "thirty-three million, nine hundred eighty-one thousand, nine hundred seventy-three".