81323 has 4 divisors (see below), whose sum is σ = 88728.
Its totient is φ = 73920.
The previous prime is 81307. The next prime is 81331. The reversal of 81323 is 32318.
It can be divided in two parts, 81 and 323, that added together give a palindrome (404).
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 81323 - 24 = 81307 is a prime.
It is a super-2 number, since 2×813232 = 13226860658, which contains 22 as substring.
It is a Duffinian number.
It is a plaindrome in base 9.
It is not an unprimeable number, because it can be changed into a prime (81343) 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 3 ways as a sum of consecutive naturals, for example, 3686 + ... + 3707.
It is an arithmetic number, because the mean of its divisors is an integer number (22182).
281323 is an apocalyptic number.
81323 is a deficient number, since it is larger than the sum of its proper divisors (7405).
81323 is a wasteful number, since it uses less digits than its factorization.
81323 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7404.
The product of its digits is 144, while the sum is 17.
The square root of 81323 is about 285.1718779964.
The cubic root of 81323 is about 43.3249227595.
The spelling of 81323 in words is "eighty-one thousand, three hundred twenty-three".