81731 (number)

81731 is an odd 5-digits composite number following 81730 and preceding 81732. In scientific notation, it is written as 8.1731 × 10^4. The sum of its digits is 20. It has a total of 2 prime factors and 4 positive divisors. There are 75432 positive integers (up to 81731) that are relatively prime to 81731.

Interesting facts

Basic properties

Name

Name eighty-one thousand seven hundred thirty-one

Notation

Scientific notation 8.1731 × 10^4
Engineering notation 8.1731 × 10^3

Prime Factorization of 81731

Prime Factorization 13 × 6287

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 81731
Product of the distinct prime numbers

The prime factorization of 81731 is 13 × 6287. Since it has a total of 2 prime factors.

Most popular turbo-numbers

1, 2, 72, 12, 36, 341, 5007, 3309, 6995, 63809, 884531, 884240, 3287278, 6699703, 14152634, 31099639, 228493027, 296740150, 6324870113, 7965990788

Basic calculations (n = 81731)

Multiplication

n×y
n×2 163462
n×3 245193
n×4 326924
n×5 408655

Division

n÷y
n÷2 40865.5
n÷3 27243.666666667
n÷3 20432.75
n÷5 16346.2

Exponentiation

ny
n2 6679956361
n3 545959513340891
n4 4.4621816984864E+19
n5 3.6469857239899E+24

Nth Root

y√n
2√n 285.88634105182
3√n 43.397256085947
4√n 16.90817379411
5√n 9.604557536161

Divisors of 81731

1, 13, 6287, 81731

4 divisors

τ Total Divisors 4
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81730
Sum of the proper positive divisors of n
A Arithmetic Mean 0.25
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 1
Returns the nth root of the product of n divisors
H Harmonic Mean 4
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81731 can be divided by 4 positive divisors. The sum of these divisors (counting 81731) is 1, the average is 0.25.

Base conversion 81731

Base System Value
2 Binary 10011111101000011
3 Ternary 11011010002
4 Quaternary 103331003
5 Quinary 10103411
6 Senary 1430215
8 Octal 237503
10 Decimal 81731
12 Duodecimal 3b36b
16 Hexadecimal 13f43
20 Vigesimal a46b
36 Base36 1r2b

Cryptographic Hash Functions

md5 8877eb44ee54d6909cb2968f9f10d580
sha1 d4cc09dd110e220f62db85d2377ee8d1709479f8
sha256 1b9a83731533cf40e5331c450df9342ea78b9685b91e667cbe3c971c79412c76
sha512 852b3f277870de947390fd3528b0d513ef6828c8e85ab6becf5e9200f09d5f692c4bd5d0427f55eb8672269bcb57556c298739c0d83d6d31fa975fb011579c24
ripemd-160 759630d2370ec792ecea2bde57fe134a9e622d98

81731 as geometric shapes

Circle

Radius = n
Diameter 163462
Circumference 513531.01834109
Area 20985701830.018

Sphere

Radius = n
Volume 2.2869098616923E+15
Surface area 83942807320.072
Circumference 513531.01834109

Square

Length = n
Perimeter 326924
Area 6679956361
Diagonal 115585.08866632

Cube

Length = n
Surface area 40079738166
Volume 545959513340891
Space diagonal 141562.24455341

Equilateral Triangle

Length = n
Perimeter 245193
Area 2892505952.3987
Altitude 70781.122276706

Triangular Pyramid

Length = n
Surface area 2892505952.3987
Volume 64341945689442
Height 38528.362888772