81663721 is an odd 8-digits prime number following 81663720
and preceding 81663722 . In scientific notation, it is written as 8.1663721 × 10^7.
The sum of its digits is 34. It has a total of 1 prime factors and 2 positive divisors.
There are 81663720 positive integers (up to 81663721) that are relatively prime to 81663721.
81663721 has 2 divisors, whose sum is 81663722
The reverse of 81663721 is 12736618
Previous prime number is 1
Is Prime? yes Number parity odd Number length 8 Sum of Digits 34 Digital Root 7
Name
eighty-one million six hundred sixty-three thousand seven hundred twenty-one
Scientific notation
8.1663721 × 10^7
Engineering notation
8.1663721 × 10^6
Prime Factorization
81663721
Composite number
ω Distinct Factors
1 Total number of distinct prime factors
Ω Total Factors
1 Total number of prime factors
rad Radical
81663721 Product of the distinct prime numbers
The prime factorization of 81663721 is 81663721.
Since it has a total of 1 prime factors.
5 , 1 , 82 , 2 , 62 , 549 , 9830 , 8562 , 7257 , 58873 , 723559 , 271171 , 8631446 , 77035 , 52069593 , 70129546 , 893735937 , 22600328 , 2715793540 , 7845889165
n×2
163327442
n×3
244991163
n×4
326654884
n×5
408318605
n÷2
40831860.5
n÷3
27221240.333333
n÷3
20415930.25
n÷5
16332744.2
n2
6668963327565841
n3
5.4461236054157E+23
n4
4.4475071864418E+31
n5
3.6319998601908E+39
2 √n9036.7981608532
3 √n433.85344956723
4 √n95.062075302684
5 √n38.2301351147
2 divisors
τ Total Divisors
2 Total number of the positive divisors of n
σ Sum of Divisors
81663722 Sum of all the positive divisors of n
s Aliquot Sum
1 Sum of the proper positive divisors of n
A Arithmetic Mean
40831861 Returns the sum of divisors (σ(n )) divided by the total number of divisors (τ(n ))
G Geometric Mean
9036.7982161825 Returns the nth root of the product of n divisors
H Harmonic Mean
1.9999999755093 Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81663721 can be divided by 2 positive divisors.
The sum of these divisors (counting 81663721) is 81663722, the average is 40831861.
Base
System
Value
2
Binary
100110111100001011011101001
3
Ternary
12200122221120021
4
Quaternary
10313201123221
5
Quinary
131401214341
6
Senary
12034200441
8
Octal
467413351
10
Decimal
81663721
12
Duodecimal
23423121
16
Hexadecimal
4de16e9
20
Vigesimal
15a7j61
36
Base36
1cmc4p
md5
84ed2b82085d91725857e2602ffa21af
sha1
6c0bd4fc326aa61bb3ce20cde8dcc9219f56398c
sha256
e35b309225a7d069f2010bf46dae294148194cab0b1b6839642fc2c334636415
sha512
18f348317835a2b4824a1e2ef771598878a3a69571517707af6edd021ade8b8bf5efaeec982d96604f0f6e80692d1cb48d53f6a7cb19afe18175380897652656
ripemd-160
c7571bcea929335415cfe549262a65fa56a36d7f
Diameter
163327442
Circumference
513108291.91681
Area
2.0951166196941E+16
Volume
2.2812669212421E+24
Surface area
8.3804664787762E+16
Circumference
513108291.91681
Perimeter
326654884
Area
6668963327565841
Diagonal
115489941.79205
Surface area
40013779965395046
Volume
5.4461236054157E+23
Space diagonal
141445713.90713
Perimeter
244991163
Area
2.8877458292894E+15
Altitude
70722856.953565
Surface area
2.8877458292894E+15
Volume
6.4183182209493E+22
Height
38496647.264018