33133981 has 8 divisors (see below), whose sum is σ = 34101504. Its totient is φ = 32170320.

The previous prime is 33133949. The next prime is 33133993. The reversal of 33133981 is 18933133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33133981 - 2⁵ = 33133949 is a prime.

It is a super-2 number, since 2×33133981² = 2195721393816722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33133181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33216 + ... + 34198.

It is an arithmetic number, because the mean of its divisors is an integer number (4262688).

Almost surely, 2^33133981 is an apocalyptic number.

It is an amenable number.

33133981 is a deficient number, since it is larger than the sum of its proper divisors (967523).

33133981 is an equidigital number, since it uses as much as digits as its factorization.

33133981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its digits is 5832, while the sum is 31.

The square root of 33133981 is about 5756.2123831561. The cubic root of 33133981 is about 321.1869364014.

The spelling of 33133981 in words is "thirty-three million, one hundred thirty-three thousand, nine hundred eighty-one".