81644981 is an odd 8-digits composite number following 81644980
and preceding 81644982 . In scientific notation, it is written as 8.1644981 × 10^7.
The sum of its digits is 41. It has a total of 3 prime factors and 8 positive divisors.
There are 72412000 positive integers (up to 81644981) that are relatively prime to 81644981.
81644981 has 8 divisors, whose sum is 91240128
The reverse of 81644981 is 18944618
Previous prime number is 11
Is Prime? no
Number parity odd
Number length 8
Sum of Digits 41
Digital Root 5
Name
eighty-one million six hundred forty-four thousand nine hundred eighty-one
Scientific notation
8.1644981 × 10^7
Engineering notation
8.1644981 × 10^6
Prime Factorization
41 × 11 × 181031
Composite number
ω
Distinct Factors
3
Total number of distinct prime factors
Ω
Total Factors
3
Total number of prime factors
rad
Radical
81644981
Product of the distinct prime numbers
The prime factorization of 81644981 is 41 × 11 × 181031.
Since it has a total of 3 prime factors.
6 , 4 , 31 , 53 , 524 , 467 , 5469 , 9466 , 91170 , 16894 , 429187 , 914300 , 6881210 , 2364819 , 74588231 , 46433076 , 943487206 , 858748108 , 7753897566 , 6364196609
n×2
163289962
n×3
244934943
n×4
326579924
n×5
408224905
n÷2
40822490.5
n÷3
27214993.666667
n÷3
20411245.25
n÷5
16328996.2
n2
6665902922490361
n3
5.4423751745457E+23
n4
4.4434261772066E+31
n5
3.6278344581293E+39
2 √n
9035.7612296917
3 √n
433.82026046955
4 √n
95.056621177547
5 √n
38.228380361196
8 divisors
τ
Total Divisors
8
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-81644980
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.125
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
8
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81644981 can be divided by 8 positive divisors.
The sum of these divisors (counting 81644981) is 1, the average is 0.125.
Base
System
Value
2
Binary
100110111011100110110110101
3
Ternary
12200121222212012
4
Quaternary
10313130312311
5
Quinary
131400114411
6
Senary
12033534005
8
Octal
467346665
10
Decimal
81644981
12
Duodecimal
23414305
16
Hexadecimal
4ddcdb5
20
Vigesimal
15a5c91
36
Base36
1clxo5
md5
d65f668b4ff6ac1b40562b0c5602e887
sha1
c5889211cb23479b2e65f44f450df0d79b8798e5
sha256
8f30f318f7be981900de04aaa69db9ba5d7cd6a0187913e40eedfe8f7b7299f3
sha512
f11f1f0e33c7bca19b739622f50ab9b43111a07ec187f142646d5e9db17f04e4713edc9c5f4c09650981abb131d3f40610050996551fa23dd4f304868fb1ae9b
ripemd-160
6ee382702394bda7562b6979ae1406d5d2d67950
Diameter
163289962
Circumference
512990545.02416
Area
2.0941551650838E+16
Volume
2.279696782191E+24
Surface area
8.3766206603354E+16
Circumference
512990545.02416
Perimeter
326579924
Area
6665902922490361
Diagonal
115463439.42989
Surface area
39995417534942166
Volume
5.4423751745457E+23
Space diagonal
141413255.275
Perimeter
244934943
Area
2.8864206350188E+15
Altitude
70706627.637498
Surface area
2.8864206350188E+15
Volume
6.4139006528043E+22
Height
38487813.143298