82281 has 4 divisors (see below), whose sum is σ = 109712.
Its totient is φ = 54852.
The previous prime is 82279. The next prime is 82301. The reversal of 82281 is 18228.
It can be divided in two parts, 822 and 81, that added together give a triangular number (903 = T42).
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 not a de Polignac number, because 82281 - 21 = 82279 is a prime.
It is a super-2 number, since 2×822812 = 13540325922, which contains 22 as substring.
It is a D-number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (82231) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13711 + ... + 13716.
It is an arithmetic number, because the mean of its divisors is an integer number (27428).
282281 is an apocalyptic number.
It is an amenable number.
82281 is a deficient number, since it is larger than the sum of its proper divisors (27431).
82281 is a wasteful number, since it uses less digits than its factorization.
82281 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27430.
The product of its digits is 256, while the sum is 21.
The square root of 82281 is about 286.8466489259.
The cubic root of 82281 is about 43.4943842665.
The spelling of 82281 in words is "eighty-two thousand, two hundred eighty-one".