Max	9223372036854775807
25835	Positive integer
0b10001100	Binary number
01771452	Octal number
0x129abf	Hex number
5.012 * 10^7	Scientific notation
2^4 * 5	Factorized form
*	Random number

81985 (number)

81985 is an odd 5-digits composite number following 81984 and preceding 81986. In scientific notation, it is written as 8.1985 × 10^4. The sum of its digits is 31. It has a total of 2 prime factors and 4 positive divisors. There are 62064 positive integers (up to 81985) that are relatively prime to 81985.

Interesting facts

81985 has 4 divisors, whose sum is 82944
The reverse of 81985 is 58918
Previous prime number is 95

Basic properties

Is Prime? no
Number parity odd
Number length 5
Sum of Digits 31
Digital Root 4

Name

Name	eighty-one thousand nine hundred eighty-five

Notation

Scientific notation	8.1985 × 10^4
Engineering notation	8.1985 × 10^3

Prime Factorization of 81985

Prime Factorization 95 × 863

Composite number

ω	Distinct Factors	2	Total number of distinct prime factors
Ω	Total Factors	2	Total number of prime factors
rad	Radical	81985	Product of the distinct prime numbers

The prime factorization of 81985 is 95 × 863. Since it has a total of 2 prime factors.

Most popular turbo-numbers

4, 9, 79, 34, 740, 941, 4187, 6556, 62429, 13005, 184524, 461948, 3443455, 7075271, 67341995, 826203, 729995766, 877733385, 9805473120, 3375804978

Basic calculations (n = 81985)

Multiplication

n×y

n×2	163970
n×3	245955
n×4	327940
n×5	409925

Division

n÷y

n÷2	40992.5
n÷3	27328.333333333
n÷3	20496.25
n÷5	16397

Exponentiation

n^y

n²	6721540225
n³	551065475346625
n⁴	4.5179102996293E+19
n⁵	3.7040087591511E+24

Nth Root

^y√n

²√n	286.33022893156
³√n	43.442165622064
⁴√n	16.921295131625
⁵√n	9.6105198531199

Divisors of 81985

1, 95, 863, 81985

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	-81984	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 81985 can be divided by 4 positive divisors. The sum of these divisors (counting 81985) is 1, the average is 0.25.

Base conversion 81985

Base	System	Value
2	Binary	10100000001000001
3	Ternary	11011110111
4	Quaternary	110001001
5	Quinary	10110420
6	Senary	1431321
8	Octal	240101
10	Decimal	81985
12	Duodecimal	3b541
16	Hexadecimal	14041
20	Vigesimal	a4j5
36	Base36	1r9d

Cryptographic Hash Functions

md5	7b44decd487991c85f79bb7ad4bcb299
sha1	352d481579685b7d75bdf81afcbd728f999dee19
sha256	424a72760a3cb584e9c6412b1658e1a0b6b903d0b6077f09e21ba3fa389b3f92
sha512	f60f7dd4b13b1e5ba9b9bc9ae00dbd4b37795b849cb31ca4e049c4654f1266f64ca07fc8b2a241243fccf0c97e635799fc3d540bc315294eb3acedd5cee81495
ripemd-160	129573f3ec0a0619ab9250b734a8e0c1c2b8c72b

81985 as geometric shapes

Circle

Radius = n

Diameter	163970
Circumference	515126.94740912
Area	21116341391.668

Sphere

Radius = n

Volume	2.3082976653279E+15
Surface area	84465365566.673
Circumference	515126.94740912

Square

Length = n

Perimeter	327940
Area	6721540225
Diagonal	115944.29891116

Cube

Length = n

Surface area	40329241350
Volume	551065475346625
Space diagonal	142002.18545853

Equilateral Triangle

Length = n

Perimeter	245955
Area	2910512293.7045
Altitude	71001.092729267

Triangular Pyramid

Length = n

Surface area	2910512293.7045
Volume	64943689082564
Height	38648.099637053