33981291 has 18 divisors (see below), whose sum is σ = 51808380. Its totient is φ = 21459816.

The previous prime is 33981289. The next prime is 33981313. The reversal of 33981291 is 19218933.

It is not a de Polignac number, because 33981291 - 2¹ = 33981289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (33981271) 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 in 17 ways as a sum of consecutive naturals, for example, 1981 + ... + 8478.

Almost surely, 2^33981291 is an apocalyptic number.

33981291 is a deficient number, since it is larger than the sum of its proper divisors (17827089).

33981291 is a wasteful number, since it uses less digits than its factorization.

33981291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10503 (or 10481 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 33981291 is about 5829.3473905747. The cubic root of 33981291 is about 323.9017477574.

The spelling of 33981291 in words is "thirty-three million, nine hundred eighty-one thousand, two hundred ninety-one".