Max	9223372036854775807
25835	Positive integer
0b10001100	Binary number
01771452	Octal number
0x129abf	Hex number
5.012 * 10^7	Scientific notation
2^4 * 5	Factorized form
*	Random number

81243721 (number)

81243721 is an odd 8-digits composite number following 81243720 and preceding 81243722. In scientific notation, it is written as 8.1243721 × 10^7. The sum of its digits is 28. It has a total of 2 prime factors and 4 positive divisors. There are 74994192 positive integers (up to 81243721) that are relatively prime to 81243721.

Interesting facts

81243721 has 4 divisors, whose sum is 87493252
The reverse of 81243721 is 12734218
Previous prime number is 13

Basic properties

Is Prime? no
Number parity odd
Number length 8
Sum of Digits 28
Digital Root 1

Name

Name	eighty-one million two hundred forty-three thousand seven hundred twenty-one

Notation

Scientific notation	8.1243721 × 10^7
Engineering notation	8.1243721 × 10^6

Prime Factorization of 81243721

Prime Factorization 13 × 6249517

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	81243721	Product of the distinct prime numbers

The prime factorization of 81243721 is 13 × 6249517. Since it has a total of 2 prime factors.

Most popular turbo-numbers

10, 3, 3, 71, 992, 346, 2951, 8584, 57303, 60372, 784914, 564577, 7154401, 352885, 1791483, 55621898, 972408678, 654521746, 7231095074, 4121934384

Basic calculations (n = 81243721)

Multiplication

n×y

n×2	162487442
n×3	243731163
n×4	324974884
n×5	406218605

Division

n÷y

n÷2	40621860.5
n÷3	27081240.333333
n÷3	20310930.25
n÷5	16248744.2

Exponentiation

n^y

n²	6600542201925841
n³	5.3625260910199E+23
n⁴	4.3567157359404E+31
n⁵	3.5395579772705E+39

Nth Root

^y√n

²√n	9013.5298856774
³√n	433.10839522335
⁴√n	94.939611783899
⁵√n	38.190730123405

Divisors of 81243721

1, 13, 6249517, 81243721

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	-81243720	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 81243721 can be divided by 4 positive divisors. The sum of these divisors (counting 81243721) is 1, the average is 0.25.

Base conversion 81243721

Base	System	Value
2	Binary	100110101111010111001001001
3	Ternary	12122212121102201
4	Quaternary	10311322321021
5	Quinary	131244244341
6	Senary	12021200201
8	Octal	465727111
10	Decimal	81243721
12	Duodecimal	23260061
16	Hexadecimal	4d7ae49
20	Vigesimal	157f961
36	Base36	1cdc21

Cryptographic Hash Functions

md5	7ae8c1cee4b8caaeecd634fcc2f7d255
sha1	c6ed1f2cb71242aabac88e853081a2834c026b34
sha256	0b9f7044fd605ae302a0cdfed04be2357133eaf159ebda5a56903ab7f321233b
sha512	0b6919a32190fc38b2ba99413a379012445127afb336a92f18dcad34ab559b0ea45f78ba925ad29e4668a22ff03672e316bdde15d8aa85be38e676be1c748cf0
ripemd-160	aa20a1a1e594198bfe48df9a54fb99d2f8c81e33

81243721 as geometric shapes

Circle

Radius = n

Diameter	162487442
Circumference	510469354.0878
Area	2.073621489128E+16

Sphere

Radius = n

Volume	2.2462496762976E+24
Surface area	8.2944859565118E+16
Circumference	510469354.0878

Square

Length = n

Perimeter	324974884
Area	6600542201925841
Diagonal	114895972.09586

Cube

Length = n

Surface area	39603253211555046
Volume	5.3625260910199E+23
Space diagonal	140718252.56795

Equilateral Triangle

Length = n

Perimeter	243731163
Area	2.8581186128095E+15
Altitude	70359126.283975

Triangular Pyramid

Length = n

Surface area	2.8581186128095E+15
Volume	6.3197976054166E+22
Height	38298657.365285