19991 (number)

19991 is an odd 5-digits prime number following 19990 and preceding 19992. In scientific notation, it is written as 1.9991 × 10^4. The sum of its digits is 29. It has a total of 1 prime factors and 2 positive divisors. There are 19990 positive integers (up to 19991) that are relatively prime to 19991.

Interesting facts

Basic properties

Name

Name nineteen thousand nine hundred ninety-one

Notation

Scientific notation 1.9991 × 10^4
Engineering notation 1.9991 × 10^3

Prime Factorization of 19991

Prime Factorization 19991

Composite number
ω Distinct Factors 1
Total number of distinct prime factors
Ω Total Factors 1
Total number of prime factors
rad Radical 19991
Product of the distinct prime numbers

The prime factorization of 19991 is 19991. Since it has a total of 1 prime factors.

Most popular turbo-numbers

8, 2, 8, 85, 489, 647, 5920, 1102, 15330, 2524, 662627, 163865, 8519303, 2314209, 86982196, 59424351, 259010747, 326965436, 9293000365, 4129925485

Basic calculations (n = 19991)

Multiplication

n×y
n×2 39982
n×3 59973
n×4 79964
n×5 99955

Division

n÷y
n÷2 9995.5
n÷3 6663.6666666667
n÷3 4997.75
n÷5 3998.2

Exponentiation

ny
n2 399640081
n3 7989204859271
n4 159712194341686561
n5 3.1928064770847E+21

Nth Root

y√n
2√n 141.38953285162
3√n 27.140103928627
4√n 11.8907330662
5√n 7.2471442176336

Divisors of 19991

1, 19991

2 divisors

τ Total Divisors 2
Total number of the positive divisors of n
σ Sum of Divisors 19992
Sum of all the positive divisors of n
s Aliquot Sum 1
Sum of the proper positive divisors of n
A Arithmetic Mean 9996
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 141.39306913707
Returns the nth root of the product of n divisors
H Harmonic Mean 1.999899959984
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 19991 can be divided by 2 positive divisors. The sum of these divisors (counting 19991) is 19992, the average is 9996.

Base conversion 19991

Base System Value
2 Binary 100111000010111
3 Ternary 1000102102
4 Quaternary 10320113
5 Quinary 1114431
6 Senary 232315
8 Octal 47027
10 Decimal 19991
12 Duodecimal b69b
16 Hexadecimal 4e17
20 Vigesimal 29jb
36 Base36 ffb

Cryptographic Hash Functions

md5 46bcb8f7477c1c33cf6dd9dd5c8045a3
sha1 9cd6cb94f9af7aab85c31af4037f54ea92a083a1
sha256 46aef32cdecef62434d3bcf526f4841bb2e1c1053c890442fe489d3ea227d591
sha512 a32650045f829cd100b699c6a7ddb311334aee26c13c4dd5f9a0f6999ab78493c4f4899439a061173758eb59a20b43b34794b6985611161b405ab59954242a1b
ripemd-160 f3cd032fc7cae54f2ed4945263a213b5ce1f1901

19991 as geometric shapes

Circle

Radius = n
Diameter 39982
Circumference 125607.15747583
Area 1255506342.5496

Sphere

Radius = n
Volume 33465103058546
Surface area 5022025370.1985
Circumference 125607.15747583

Square

Length = n
Perimeter 79964
Area 399640081
Diagonal 28271.543325401

Cube

Length = n
Surface area 2397840486
Volume 7989204859271
Space diagonal 34625.427694109

Equilateral Triangle

Length = n
Perimeter 59973
Area 173049231.25824
Altitude 17312.713847055

Triangular Pyramid

Length = n
Surface area 173049231.25824
Volume 941536822046.51
Height 9423.8477751335