81978981 (number)

81978981 is an odd 8-digits composite number following 81978980 and preceding 81978982. In scientific notation, it is written as 8.1978981 × 10^7. The sum of its digits is 51. It has a total of 5 prime factors and 32 positive divisors. There are 43877376 positive integers (up to 81978981) that are relatively prime to 81978981.

Interesting facts

Basic properties

Name

Name eighty-one million nine hundred seventy-eight thousand nine hundred eighty-one

Notation

Scientific notation 8.1978981 × 10^7
Engineering notation 8.1978981 × 10^6

Prime Factorization of 81978981

Prime Factorization 3 × 17 × 7 × 277 × 829

Composite number
ω Distinct Factors 5
Total number of distinct prime factors
Ω Total Factors 5
Total number of prime factors
rad Radical 81978981
Product of the distinct prime numbers

The prime factorization of 81978981 is 3 × 17 × 7 × 277 × 829. Since it has a total of 5 prime factors.

Most popular turbo-numbers

1, 1, 56, 19, 364, 160, 7595, 2156, 98274, 71608, 263822, 822517, 6620285, 6527044, 80890502, 65967581, 491956084, 661417150, 7532784375, 5104369903

Basic calculations (n = 81978981)

Multiplication

n×y
n×2 163957962
n×3 245936943
n×4 327915924
n×5 409894905

Division

n÷y
n÷2 40989490.5
n÷3 27326327
n÷3 20494745.25
n÷5 16395796.2

Exponentiation

ny
n2 6720553325798361
n3 5.5094411340511E+23
n4 4.5165837004899E+31
n5 3.7026492936737E+39

Nth Root

y√n
2√n 9054.2244836319
3√n 434.4110248127
4√n 95.15368875473
5√n 38.259606865535

Divisors of 81978981

1, 3, 7, 17, 21, 51, 119, 277, 357, 829, 831, 1939, 2487, 4709, 5803, 5817, 14093, 14127, 17409, 32963, 42279, 98651, 98889, 229633, 295953, 688899, 1607431, 3903761, 4822293, 11711283, 27326327, 81978981

32 divisors

τ Total Divisors 32
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81978980
Sum of the proper positive divisors of n
A Arithmetic Mean 0.03125
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 32
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81978981 can be divided by 32 positive divisors. The sum of these divisors (counting 81978981) is 1, the average is 0.03125.

Base conversion 81978981

Base System Value
2 Binary 100111000101110011001100101
3 Ternary 12201020222000120
4 Quaternary 10320232121211
5 Quinary 131441311411
6 Senary 12045032153
8 Octal 470563145
10 Decimal 81978981
12 Duodecimal 23555659
16 Hexadecimal 4e2e665
20 Vigesimal 15c7791
36 Base36 1ct3dx

Cryptographic Hash Functions

md5 77b713af8590f00978ba23dd86dd59c0
sha1 b683ba20e1c657d72f374df9703abaeb525f87f2
sha256 3fa1d7d91c0903362ba585453969e16e7b48a7ac879cd63fad001cf633741293
sha512 29afb308be48c7f8486de5e76b4f27b2952003b8b4baf1779ae2d3d99918120655e769d7afc314d26a86f55d99eae55a3987883723910ad55e6469dfab1b7aab
ripemd-160 8dd4ee8216509551174789d420e78a46f2dcdec5

81978981 as geometric shapes

Circle

Radius = n
Diameter 163957962
Circumference 515089128.91675
Area 2.1113240956387E+16

Sphere

Radius = n
Volume 2.307789305616E+24
Surface area 8.4452963825546E+16
Circumference 515089128.91675

Square

Length = n
Perimeter 327915924
Area 6720553325798361
Diagonal 115935786.75973

Cube

Length = n
Surface area 40323319954790166
Volume 5.5094411340511E+23
Space diagonal 141991760.24472

Equilateral Triangle

Length = n
Perimeter 245936943
Area 2.9100849538147E+15
Altitude 70995880.122362

Triangular Pyramid

Length = n
Surface area 2.9100849538147E+15
Volume 6.4929386440594E+22
Height 38645262.253242