81885833 has 4 divisors (see below), whose sum is σ = 81915600. Its totient is φ = 81856068.

The previous prime is 81885799. The next prime is 81885841. The reversal of 81885833 is 33858818.

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 81885833 - 2⁸ = 81885577 is a prime.

It is a super-2 number, since 2×81885833² = 13410579292207778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81885863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10283 + ... + 16416.

It is an arithmetic number, because the mean of its divisors is an integer number (20478900).

Almost surely, 2^81885833 is an apocalyptic number.

It is an amenable number.

81885833 is a deficient number, since it is larger than the sum of its proper divisors (29767).

81885833 is a wasteful number, since it uses less digits than its factorization.

81885833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29766.

The product of its digits is 184320, while the sum is 44.

The square root of 81885833 is about 9049.0791244192. The cubic root of 81885833 is about 434.2464303717.

The spelling of 81885833 in words is "eighty-one million, eight hundred eighty-five thousand, eight hundred thirty-three".