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82681 = 89929
BaseRepresentation
bin10100001011111001
311012102021
4110023321
510121211
61434441
7463024
oct241371
9135367
1082681
1157135
123ba21
132b831
14221bb
1519771
hex142f9

82681 has 4 divisors (see below), whose sum is σ = 83700. Its totient is φ = 81664.

The previous prime is 82657. The next prime is 82699. The reversal of 82681 is 18628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7056 + 75625 = 84^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 82681 - 213 = 74489 is a prime.

It is a super-2 number, since 2×826812 = 13672295522, which contains 22 as substring.

It is a Duffinian number.

82681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (82601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (20925).

282681 is an apocalyptic number.

It is an amenable number.

82681 is a deficient number, since it is larger than the sum of its proper divisors (1019).

82681 is an equidigital number, since it uses as much as digits as its factorization.

82681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its digits is 768, while the sum is 25.

The square root of 82681 is about 287.5430402566. The cubic root of 82681 is about 43.5647514115.

The spelling of 82681 in words is "eighty-two thousand, six hundred eighty-one".

Divisors: 1 89 929 82681