245 is an odd 3-digits composite number following 244
and preceding 246 . In scientific notation, it is written as 2.45 × 10^2.
The sum of its digits is 11. It has a total of 3 prime factors and 6 positive divisors.
There are 168 positive integers (up to 245) that are relatively prime to 245.
245 has 6 divisors, whose sum is 342
The reverse of 245 is 542
Previous prime number is 5
Is Prime? no
Number parity odd
Number length 3
Sum of Digits 11
Digital Root 2
Name
two hundred forty-five
Scientific notation
2.45 × 10^2
Engineering notation
2.45 × 10^0
Prime Factorization
7 × 5 × 7
Composite number
ω
Distinct Factors
2
Total number of distinct prime factors
Ω
Total Factors
3
Total number of prime factors
rad
Radical
35
Product of the distinct prime numbers
The prime factorization of 245 is 7 × 5 × 7.
Since it has a total of 3 prime factors.
9 , 6 , 68 , 68 , 711 , 765 , 3270 , 4119 , 12120 , 61469 , 838044 , 135331 , 146296 , 6012586 , 84635526 , 66073171 , 54770216 , 828593658 , 2295473509 , 1195856513
n×2
490
n×3
735
n×4
980
n×5
1225
n÷2
122.5
n÷3
81.666666666667
n÷3
61.25
n÷5
49
n2
60025
n3
14706125
n4
3603000625
n5
882735153125
2 √n
15.652475842499
3 √n
6.257324745676
4 √n
3.9563209984149
5 √n
3.0049220937458
6 divisors
τ
Total Divisors
6
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-244
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.16666666666667
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
6
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 245 can be divided by 6 positive divisors.
The sum of these divisors (counting 245) is 1, the average is 0.16666666666667.
Base
System
Value
2
Binary
11110101
3
Ternary
100002
4
Quaternary
3311
5
Quinary
1440
6
Senary
1045
8
Octal
365
10
Decimal
245
12
Duodecimal
185
16
Hexadecimal
f5
20
Vigesimal
c5
36
Base36
6t
md5
0266e33d3f546cb5436a10798e657d97
sha1
3aed9b0313f9226111de8aeabaedccf8db07d428
sha256
011af72a910ac4acf367eef9e6b761e0980842c30d4e9809840f4141d5163ede
sha512
46e59410cf5010798015775e98b4aff99a6d410d2322a6498fcf428d119ac463ccb70af91fe7404a6ab0fce33d2bc3a570a19c8dc06f75cf61d8ca10ff8b1275
ripemd-160
e5d952522d7549a592bf7c02639587e3315491d2
Diameter
490
Circumference
1539.380400259
Area
188574.09903173
Volume
61600872.350364
Surface area
754296.39612691
Circumference
1539.380400259
Perimeter
980
Area
60025
Diagonal
346.48232278141
Surface area
360150
Volume
14706125
Space diagonal
424.35244785437
Perimeter
735
Area
25991.58743108
Altitude
212.17622392719
Surface area
25991.58743108
Volume
1733133.4520795
Height
115.4941075938