81933833 has 8 divisors (see below), whose sum is σ = 86346720. Its totient is φ = 77531040.

The previous prime is 81933821. The next prime is 81933847. The reversal of 81933833 is 33833918.

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 81933833 - 2⁶ = 81933769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81933853) 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 7 ways as a sum of consecutive naturals, for example, 18878 + ... + 22808.

It is an arithmetic number, because the mean of its divisors is an integer number (10793340).

Almost surely, 2^81933833 is an apocalyptic number.

It is an amenable number.

81933833 is a deficient number, since it is larger than the sum of its proper divisors (4412887).

81933833 is a wasteful number, since it uses less digits than its factorization.

81933833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5047.

The product of its digits is 46656, while the sum is 38.

The square root of 81933833 is about 9051.7309394392. The cubic root of 81933833 is about 434.3312629427.

The spelling of 81933833 in words is "eighty-one million, nine hundred thirty-three thousand, eight hundred thirty-three".