1561 (number)

1561 is an odd 4-digits composite number following 1560 and preceding 1562. In scientific notation, it is written as 1.561 × 10^3. The sum of its digits is 13. It has a total of 2 prime factors and 4 positive divisors. There are 1332 positive integers (up to 1561) that are relatively prime to 1561.

Interesting facts

Basic properties

Name

Name one thousand five hundred sixty-one

Notation

Scientific notation 1.561 × 10^3
Engineering notation 1.561 × 10^3

Prime Factorization of 1561

Prime Factorization 7 × 223

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 1561
Product of the distinct prime numbers

The prime factorization of 1561 is 7 × 223. Since it has a total of 2 prime factors.

Most popular turbo-numbers

10, 7, 81, 86, 493, 538, 8865, 5815, 1633, 38275, 616462, 660556, 3175698, 3941626, 70996139, 23440782, 549355528, 330637983, 9052513340, 4890871617

Basic calculations (n = 1561)

Multiplication

n×y
n×2 3122
n×3 4683
n×4 6244
n×5 7805

Division

n÷y
n÷2 780.5
n÷3 520.33333333333
n÷3 390.25
n÷5 312.2

Exponentiation

ny
n2 2436721
n3 3803721481
n4 5937609231841
n5 9268608010903801

Nth Root

y√n
2√n 39.509492530277
3√n 11.600257624084
4√n 6.2856576847834
5√n 4.3519167668351

Divisors of 1561

1, 7, 223, 1561

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 -1560
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 1561 can be divided by 4 positive divisors. The sum of these divisors (counting 1561) is 1, the average is 0.25.

Base conversion 1561

Base System Value
2 Binary 11000011001
3 Ternary 2010211
4 Quaternary 120121
5 Quinary 22221
6 Senary 11121
8 Octal 3031
10 Decimal 1561
12 Duodecimal aa1
16 Hexadecimal 619
20 Vigesimal 3i1
36 Base36 17d

Cryptographic Hash Functions

md5 b132ecc1609bfcf302615847c1caa69a
sha1 0310477142171b7d67f2a1cd85c90a3b66be9c57
sha256 8bcefa497af26e688b555d1c4c8cc97365522b5a1416ceb099a98b4c2ed80585
sha512 816f74839aff001255a4e3fdbc354fd23aeaada1bbd44148e4fad015650143c818f741024cac050b6a4e22ce4d8d64b9591078a1d46d4776a6c51077b937bed0
ripemd-160 2c29db4cbc59e49303a8083b736b2f63512ddfac

1561 as geometric shapes

Circle

Radius = n
Diameter 3122
Circumference 9808.0522645073
Area 7655184.792448

Sphere

Radius = n
Volume 15932991281.348
Surface area 30620739.169792
Circumference 9808.0522645073

Square

Length = n
Perimeter 6244
Area 2436721
Diagonal 2207.5873708644

Cube

Length = n
Surface area 14620326
Volume 3803721481
Space diagonal 2703.731310615

Equilateral Triangle

Length = n
Perimeter 4683
Area 1055131.1439675
Altitude 1351.8656553075

Triangular Pyramid

Length = n
Surface area 1055131.1439675
Volume 448272875.49334
Height 735.8624569548