33116981 has 4 divisors (see below), whose sum is σ = 34860000. Its totient is φ = 31373964.

The previous prime is 33116953. The next prime is 33117041. The reversal of 33116981 is 18961133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33116981 - 2¹⁴ = 33100597 is a prime.

It is a super-2 number, since 2×33116981² = 2193468861108722, 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 (33116921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871481 + ... + 871518.

It is an arithmetic number, because the mean of its divisors is an integer number (8715000).

Almost surely, 2^33116981 is an apocalyptic number.

It is an amenable number.

33116981 is a deficient number, since it is larger than the sum of its proper divisors (1743019).

33116981 is a wasteful number, since it uses less digits than its factorization.

33116981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743018.

The product of its digits is 3888, while the sum is 32.

The square root of 33116981 is about 5754.7355282411. The cubic root of 33116981 is about 321.1319967108.

The spelling of 33116981 in words is "thirty-three million, one hundred sixteen thousand, nine hundred eighty-one".