81291208 (number)

81291208 is an even 8-digits composite number following 81291207 and preceding 81291209. In scientific notation, it is written as 8.1291208 × 10^7. The sum of its digits is 31. It has a total of 5 prime factors and 16 positive divisors. There are 40616400 positive integers (up to 81291208) that are relatively prime to 81291208.

Interesting facts

Basic properties

Name

Name eighty-one million two hundred ninety-one thousand two hundred eight

Notation

Scientific notation 8.1291208 × 10^7
Engineering notation 8.1291208 × 10^6

Prime Factorization of 81291208

Prime Factorization 2 × 2 × 2 × 1871 × 5431

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 5
Total number of prime factors
rad Radical 20322802
Product of the distinct prime numbers

The prime factorization of 81291208 is 2 × 2 × 2 × 1871 × 5431. Since it has a total of 5 prime factors.

Most popular turbo-numbers

5, 3, 55, 33, 470, 649, 7023, 4612, 81325, 69114, 319226, 550629, 444898, 2648492, 57642306, 58628018, 629735865, 904465026, 5091484792, 7562308659

Basic calculations (n = 81291208)

Multiplication

n×y
n×2 162582416
n×3 243873624
n×4 325164832
n×5 406456040

Division

n÷y
n÷2 40645604
n÷3 27097069.333333
n÷3 20322802
n÷5 16258241.6

Exponentiation

ny
n2 6608260498099264
n3 5.3719347866917E+23
n4 4.3669106810739E+31
n5 3.549914444926E+39

Nth Root

y√n
2√n 9016.1637074756
3√n 433.19276282029
4√n 94.953481808071
5√n 38.195193580559

Divisors of 81291208

1, 2, 4, 8, 1871, 3742, 5431, 7484, 10862, 14968, 21724, 43448, 10161401, 20322802, 40645604, 81291208

16 divisors

τ Total Divisors 16
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81291207
Sum of the proper positive divisors of n
A Arithmetic Mean 0.0625
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 16
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81291208 can be divided by 16 positive divisors. The sum of these divisors (counting 81291208) is 1, the average is 0.0625.

Base conversion 81291208

Base System Value
2 Binary 100110110000110011111001000
3 Ternary 12122222000120111
4 Quaternary 10312012133020
5 Quinary 131302304313
6 Senary 12022204104
8 Octal 466063710
10 Decimal 81291208
12 Duodecimal 23283634
16 Hexadecimal 4d867c8
20 Vigesimal 1581808
36 Base36 1cecp4

Cryptographic Hash Functions

md5 fe367de50c430ae34f6772b0dfe3a4b9
sha1 2a5ed5a0a9fd36cf7392a0248568fdb0ff943a4b
sha256 6084c1c40d96e8196e2ac3be4823dcb9462f2868427e46e9eabeca552c458187
sha512 71635e74bca7bca8e266f241cc18028576459989b4cda2b01f173aba395395955f7f8fccf78cb13fbf0913a7a11ae0d2ee619411df15056c41525ff0e9362a30
ripemd-160 0d31a00c6912e94b03f58aed6583ab5b2a8415ad

81291208 as geometric shapes

Circle

Radius = n
Diameter 162582416
Circumference 510767723.70848
Area 2.0760462633836E+16

Sphere

Radius = n
Volume 2.2501907815245E+24
Surface area 8.3041850535345E+16
Circumference 510767723.70848

Square

Length = n
Perimeter 325164832
Area 6608260498099264
Diagonal 114963128.85529

Cube

Length = n
Surface area 39649562988595584
Volume 5.3719347866917E+23
Space diagonal 140800502.46465

Equilateral Triangle

Length = n
Perimeter 243873624
Area 2.8614607330896E+15
Altitude 70400251.232325

Triangular Pyramid

Length = n
Surface area 2.8614607330896E+15
Volume 6.3308858596027E+22
Height 38321042.951764