81983 has 8 divisors (see below), whose sum is σ = 92880. Its totient is φ = 71680.

The previous prime is 81973. The next prime is 82003. The reversal of 81983 is 38918.

It is a happy number.

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 81983 - 2⁴ = 81967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81943) 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, 191 + ... + 447.

It is an arithmetic number, because the mean of its divisors is an integer number (11610).

2⁸¹⁹⁸³ is an apocalyptic number.

81983 is a deficient number, since it is larger than the sum of its proper divisors (10897).

81983 is a wasteful number, since it uses less digits than its factorization.

81983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its digits is 1728, while the sum is 29.

The square root of 81983 is about 286.3267364393. The cubic root of 81983 is about 43.4418123662.

It can be divided in two parts, 8 and 1983, that added together give a palindrome (1991).

The spelling of 81983 in words is "eighty-one thousand, nine hundred eighty-three".