81683 has 6 divisors (see below), whose sum is σ = 95076.
Its totient is φ = 69972.
The previous prime is 81677. The next prime is 81689. The reversal of 81683 is 38618.
81683 = T162 + T163 + ... +
It is an interprime number because it is at equal distance from previous prime (81677) and next prime (81689).
It is not a de Polignac number, because 81683 - 24 = 81667 is a prime.
It is a super-2 number, since 2×816832 = 13344224978, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (81689) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 785 + ... + 882.
It is an arithmetic number, because the mean of its divisors is an integer number (15846).
281683 is an apocalyptic number.
81683 is a deficient number, since it is larger than the sum of its proper divisors (13393).
81683 is a wasteful number, since it uses less digits than its factorization.
81683 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1681 (or 1674 counting only the distinct ones).
The product of its digits is 1152, while the sum is 26.
The square root of 81683 is about 285.8023792763.
The cubic root of 81683 is about 43.3887587952.
The spelling of 81683 in words is "eighty-one thousand, six hundred eighty-three".