Properties of the Number 18641

Eighteen Thousand Six Hundred Forty-One

Basics

Value: 18640 → 18641 → 18642

Parity: odd

Prime: No

Previous Prime: 18637

Next Prime: 18661

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 2663

Divisors: 1, 7, 2663, 18641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011010001

Octal: 44321

Duodecimal: A955

Hexadecimal: 48d1

Square: 347486881

Square Root: 136.53204751998703

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of days after Jan 01 1000 such that the date written in the format DDMMYYYY is palindromic. A210885

Denominators of convergents to the comma of Pythagoras. A46102

Numbers n such that μ(n) + μ(n+1) + μ(n+2) + μ(n+3) + μ(n+4) + μ(n+5) + μ(n+6) = 6. A82967

Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*x(i)² zero. A188007

Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 1 X 5 or 5 X 1 block. A145969

T(n,k)=Number of nondecreasing arrangements of n numbers x(i) in -(n+k-2)..(n+k-2) with the sum of sign(x(i))*x(i)² zero. A188002

Divisors of 777. A18641

Sum of the components of twin prime pairs less than the 10ⁿ-th prime. A118493