45 (number)

45 is an odd 2-digits composite number following 44 and preceding 46. In scientific notation, it is written as 4.5 × 10^1. The sum of its digits is 9. It has a total of 2 prime factors and 4 positive divisors. There are 24 positive integers (up to 45) that are relatively prime to 45.

Interesting facts

Basic properties

Name

Name forty-five

Notation

Scientific notation 4.5 × 10^1
Engineering notation 4.5 × 10^0

Prime Factorization of 45

Prime Factorization 15 × 3

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 45
Product of the distinct prime numbers

The prime factorization of 45 is 15 × 3. Since it has a total of 2 prime factors.

Most popular turbo-numbers

3, 6, 11, 5, 711, 250, 5652, 7148, 25756, 97980, 656949, 432362, 2819055, 8453268, 45624538, 73705140, 567652507, 840411283, 8392436362, 4342146128

Basic calculations (n = 45)

Multiplication

n×y
n×2 90
n×3 135
n×4 180
n×5 225

Division

n÷y
n÷2 22.5
n÷3 15
n÷3 11.25
n÷5 9

Exponentiation

ny
n2 2025
n3 91125
n4 4100625
n5 184528125

Nth Root

y√n
2√n 6.7082039324994
3√n 3.5568933044901
4√n 2.5900200641114
5√n 2.1411273683383

Divisors of 45

1, 3, 15, 45

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 -44
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 45 can be divided by 4 positive divisors. The sum of these divisors (counting 45) is 1, the average is 0.25.

Base conversion 45

Base System Value
2 Binary 101101
3 Ternary 1200
4 Quaternary 231
5 Quinary 140
6 Senary 113
8 Octal 55
10 Decimal 45
12 Duodecimal 39
16 Hexadecimal 2d
20 Vigesimal 25
36 Base36 19

Cryptographic Hash Functions

md5 6c8349cc7260ae62e3b1396831a8398f
sha1 fb644351560d8296fe6da332236b1f8d61b2828a
sha256 811786ad1ae74adfdd20dd0372abaaebc6246e343aebd01da0bfc4c02bf0106c
sha512 0b14aba28095d950570ca8cf3a68f33a4d2c3b1aec2a5dcf85df45b0e7cf615bc3e1d4b8ebcf3ee95c9f7b8cee721cefd12f33b5a40db14634c969d77906bac4
ripemd-160 f1dc6f6543716ada0fa3276d2de71cbd2f202864

45 as geometric shapes

Circle

Radius = n
Diameter 90
Circumference 282.74333882308
Area 6361.7251235193

Sphere

Radius = n
Volume 381703.50741116
Surface area 25446.900494077
Circumference 282.74333882308

Square

Length = n
Perimeter 180
Area 2025
Diagonal 63.639610306789

Cube

Length = n
Surface area 12150
Volume 91125
Space diagonal 77.942286340599

Equilateral Triangle

Length = n
Perimeter 135
Area 876.85072133174
Altitude 38.9711431703

Triangular Pyramid

Length = n
Surface area 876.85072133174
Volume 10739.184239271
Height 21.213203435596