33993881 has 2 divisors, whose sum is σ = 33993882. Its totient is φ = 33993880.

The previous prime is 33993851. The next prime is 33993901. The reversal of 33993881 is 18839933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21855625 + 12138256 = 4675^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 33993881 - 2¹⁰ = 33992857 is a prime.

It is a super-2 number, since 2×33993881² = 2311167890884322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33993851) 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, 16996940 + 16996941.

It is an arithmetic number, because the mean of its divisors is an integer number (16996941).

Almost surely, 2^33993881 is an apocalyptic number.

It is an amenable number.

33993881 is a deficient number, since it is larger than the sum of its proper divisors (1).

33993881 is an equidigital number, since it uses as much as digits as its factorization.

33993881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 33993881 is about 5830.4271713143. The cubic root of 33993881 is about 323.9417444670.

The spelling of 33993881 in words is "thirty-three million, nine hundred ninety-three thousand, eight hundred eighty-one".