17991 (number)

17991 is an odd 5-digits composite number following 17990 and preceding 17992. In scientific notation, it is written as 1.7991 × 10^4. The sum of its digits is 27. It has a total of 2 prime factors and 4 positive divisors. There are 11988 positive integers (up to 17991) that are relatively prime to 17991.

Interesting facts

Basic properties

Name

Name seventeen thousand nine hundred ninety-one

Notation

Scientific notation 1.7991 × 10^4
Engineering notation 1.7991 × 10^3

Prime Factorization of 17991

Prime Factorization 9 × 1999

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 17991
Product of the distinct prime numbers

The prime factorization of 17991 is 9 × 1999. Since it has a total of 2 prime factors.

Most popular turbo-numbers

3, 2, 92, 30, 173, 502, 4086, 743, 87848, 12899, 477397, 720586, 6014569, 1215579, 44841534, 76048686, 444631666, 654711103, 3108072434, 6618607243

Basic calculations (n = 17991)

Multiplication

n×y
n×2 35982
n×3 53973
n×4 71964
n×5 89955

Division

n÷y
n÷2 8995.5
n÷3 5997
n÷3 4497.75
n÷5 3598.2

Exponentiation

ny
n2 323676081
n3 5823256373271
n4 104766205411518561
n5 1.8848488015586E+21

Nth Root

y√n
2√n 134.13053343665
3√n 26.203045311579
4√n 11.581473716097
5√n 7.0959583988288

Divisors of 17991

1, 9, 1999, 17991

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 -17990
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 17991 can be divided by 4 positive divisors. The sum of these divisors (counting 17991) is 1, the average is 0.25.

Base conversion 17991

Base System Value
2 Binary 100011001000111
3 Ternary 220200100
4 Quaternary 10121013
5 Quinary 1033431
6 Senary 215143
8 Octal 43107
10 Decimal 17991
12 Duodecimal a4b3
16 Hexadecimal 4647
20 Vigesimal 24jb
36 Base36 dvr

Cryptographic Hash Functions

md5 7ce5417e80aef872ba20917011e39416
sha1 4ce45e74ef4a8701eaaa4e8fb17bab705ebd772c
sha256 987f32746376de3fa8ff935ec01448a5936c8e222ce383cf89b4dc2ecdc67ea8
sha512 b9926371eb5022b27b43e08bb30040cb4ed8938e0ab7ec0495a9ee176faae0e9ff6f392d801bf6c610080813568810202364100273883e5057c2ab3bd57887ec
ripemd-160 539a92295160a605e9b0c947e58acba25b2dce0a

17991 as geometric shapes

Circle

Radius = n
Diameter 35982
Circumference 113040.78686147
Area 1016858398.2123

Sphere

Radius = n
Volume 24392399256317
Surface area 4067433592.8493
Circumference 113040.78686147

Square

Length = n
Perimeter 71964
Area 323676081
Diagonal 25443.116200654

Cube

Length = n
Surface area 1942056486
Volume 5823256373271
Space diagonal 31161.326078972

Equilateral Triangle

Length = n
Perimeter 53973
Area 140155854.37169
Altitude 15580.663039486

Triangular Pyramid

Length = n
Surface area 140155854.37169
Volume 686277345021.28
Height 8481.0387335515