81273721 is an odd 8-digits prime number following 81273720
and preceding 81273722 . In scientific notation, it is written as 8.1273721 × 10^7.
The sum of its digits is 31. It has a total of 1 prime factors and 2 positive divisors.
There are 81273720 positive integers (up to 81273721) that are relatively prime to 81273721.
81273721 has 2 divisors, whose sum is 81273722
The reverse of 81273721 is 12737218
Previous prime number is 1
Is Prime? yes Number parity odd Number length 8 Sum of Digits 31 Digital Root 4
Name
eighty-one million two hundred seventy-three thousand seven hundred twenty-one
Scientific notation
8.1273721 × 10^7
Engineering notation
8.1273721 × 10^6
Prime Factorization
81273721
Composite number
ω Distinct Factors
1 Total number of distinct prime factors
Ω Total Factors
1 Total number of prime factors
rad Radical
81273721 Product of the distinct prime numbers
The prime factorization of 81273721 is 81273721.
Since it has a total of 1 prime factors.
4 , 9 , 8 , 48 , 577 , 354 , 2975 , 4465 , 84518 , 94833 , 267596 , 609802 , 1793813 , 61866 , 82897340 , 9379367 , 555564164 , 729039630 , 8887234771 , 6459115972
n×2
162547442
n×3
243821163
n×4
325094884
n×5
406368605
n÷2
40636860.5
n÷3
27091240.333333
n÷3
20318430.25
n÷5
16254744.2
n2
6605417725185841
n3
5.3684687728521E+23
n4
4.3631543324199E+31
n5
3.5460978789304E+39
2 √n9015.1938969719
3 √n433.16169843141
4 √n94.948374904323
5 √n38.193550163402
2 divisors
τ Total Divisors
2 Total number of the positive divisors of n
σ Sum of Divisors
81273722 Sum of all the positive divisors of n
s Aliquot Sum
1 Sum of the proper positive divisors of n
A Arithmetic Mean
40636861 Returns the sum of divisors (σ(n )) divided by the total number of divisors (τ(n ))
G Geometric Mean
9015.1939524339 Returns the nth root of the product of n divisors
H Harmonic Mean
1.9999999753918 Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81273721 can be divided by 2 positive divisors.
The sum of these divisors (counting 81273721) is 81273722, the average is 40636861.
Base
System
Value
2
Binary
100110110000010001101111001
3
Ternary
12122221010120211
4
Quaternary
10312002031321
5
Quinary
131301224341
6
Senary
12021551121
8
Octal
466021571
10
Decimal
81273721
12
Duodecimal
232754a1
16
Hexadecimal
4d82379
20
Vigesimal
157j461
36
Base36
1cdz7d
md5
f281c8d3ab17d0e4bf8a853016fd1f62
sha1
c2c22e94629446c55f5ccd2b391a07ac3045b768
sha256
dc5db57cfb253a9b171f6dba03ff9fd347ff229f008e6f97743a82e11666c422
sha512
46eeceb15915fa826d887337be038e04da6d509808e8278601a1bdb7518a67142505ac657860412614d7c8ca525b1c1f61022bd396789d9373308aa1f3cba190
ripemd-160
3e5b09eba19b0e96956a2e71c7fd087cfc88c4ee
Diameter
162547442
Circumference
510657849.64701
Area
2.0751531799336E+16
Volume
2.2487389410424E+24
Surface area
8.3006127197343E+16
Circumference
510657849.64701
Perimeter
325094884
Area
6605417725185841
Diagonal
114938398.50273
Surface area
39632506351115046
Volume
5.3684687728521E+23
Space diagonal
140770214.09218
Perimeter
243821163
Area
2.8602297763095E+15
Altitude
70385107.046089
Surface area
2.8602297763095E+15
Volume
6.3268011231199E+22
Height
38312799.500909