81823983 has 16 divisors (see below), whose sum is σ = 112721376. Its totient is φ = 52755840.

The previous prime is 81823979. The next prime is 81823991. The reversal of 81823983 is 38932818.

It is not a de Polignac number, because 81823983 - 2² = 81823979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81823913) 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 15 ways as a sum of consecutive naturals, for example, 17073 + ... + 21333.

It is an arithmetic number, because the mean of its divisors is an integer number (7045086).

Almost surely, 2^81823983 is an apocalyptic number.

81823983 is a deficient number, since it is larger than the sum of its proper divisors (30897393).

81823983 is a wasteful number, since it uses less digits than its factorization.

81823983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474.

The product of its digits is 82944, while the sum is 42.

The square root of 81823983 is about 9045.6610040395. The cubic root of 81823983 is about 434.1370711751.

The spelling of 81823983 in words is "eighty-one million, eight hundred twenty-three thousand, nine hundred eighty-three".