81491 (number)

81491 is an odd 5-digits composite number following 81490 and preceding 81492. In scientific notation, it is written as 8.1491 × 10^4. The sum of its digits is 23. It has a total of 2 prime factors and 4 positive divisors. There are 77184 positive integers (up to 81491) that are relatively prime to 81491.

Interesting facts

Basic properties

Name

Name eighty-one thousand four hundred ninety-one

Notation

Scientific notation 8.1491 × 10^4
Engineering notation 8.1491 × 10^3

Prime Factorization of 81491

Prime Factorization 19 × 4289

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 81491
Product of the distinct prime numbers

The prime factorization of 81491 is 19 × 4289. Since it has a total of 2 prime factors.

Most popular turbo-numbers

9, 2, 82, 96, 901, 973, 406, 9878, 79071, 38014, 949419, 110005, 1082444, 6401861, 77132793, 95800358, 459184601, 163552990, 1583190245, 518802052

Basic calculations (n = 81491)

Multiplication

n×y
n×2 162982
n×3 244473
n×4 325964
n×5 407455

Division

n÷y
n÷2 40745.5
n÷3 27163.666666667
n÷3 20372.75
n÷5 16298.2

Exponentiation

ny
n2 6640783081
n3 541164054053771
n4 4.4099999928896E+19
n5 3.5937530942057E+24

Nth Root

y√n
2√n 285.46628522472
3√n 43.354736304072
4√n 16.895747548561
5√n 9.5989102147841

Divisors of 81491

1, 19, 4289, 81491

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 -81490
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 81491 can be divided by 4 positive divisors. The sum of these divisors (counting 81491) is 1, the average is 0.25.

Base conversion 81491

Base System Value
2 Binary 10011111001010011
3 Ternary 11010210012
4 Quaternary 103321103
5 Quinary 10101431
6 Senary 1425135
8 Octal 237123
10 Decimal 81491
12 Duodecimal 3b1ab
16 Hexadecimal 13e53
20 Vigesimal a3eb
36 Base36 1qvn

Cryptographic Hash Functions

md5 20b02e57f3c1a6b7d540329b76cd61a6
sha1 31b57d033b6d3e5df53bf02c92a4a6974ff431e6
sha256 eada6b374154e81054cf1f22030ac7fc08f81c507b3c8f37a0dd3343f215c238
sha512 ed3b93b92b6395582b3174e8af64a74ed0899ff66bb12a50b167c47550fc0388a289804d2720c7021ba88afaa93ca888c7dba670906dd434bfc8bd2fb519500a
ripemd-160 53fbde5e53da3971b873d2a0733afae073fd85b7

81491 as geometric shapes

Circle

Radius = n
Diameter 162982
Circumference 512023.05386737
Area 20862635341.353

Sphere

Radius = n
Volume 2.2668226888029E+15
Surface area 83450541365.412
Circumference 512023.05386737

Square

Length = n
Perimeter 325964
Area 6640783081
Diagonal 115245.67741135

Cube

Length = n
Surface area 39844698486
Volume 541164054053771
Space diagonal 141146.5523596

Equilateral Triangle

Length = n
Perimeter 244473
Area 2875543424.5839
Altitude 70573.276179798

Triangular Pyramid

Length = n
Surface area 2875543424.5839
Volume 63776795392637
Height 38415.225803782