Properties of the Number 8641

Eight Thousand Six Hundred Forty-One

Basics

Value: 8640 → 8641 → 8642

Parity: odd

Prime: Yes

Previous Prime: 8629

Next Prime: 8647

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 8641

Divisors: 1, 8641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000111000001

Octal: 20701

Duodecimal: 5001

Hexadecimal: 21c1

Square: 74666881

Square Root: 92.9569792968769

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

Narayana's cows sequence: a(0) = a(1) = a(2) = 1; thereafter a(n) = a(n-1) + a(n-3). A930

a(n) = a(n-1) + a(n-3) for n >= 3, with a(0) = 1, a(1) = a(2) = 0. This recurrence can also be used to define a(n) for n < 0. A78012

Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2. A107920

a(n) = -a(n-1) - 2·a(n-2). A1607

Balanced primes of order eight. A96700

List of different primes in Pascal-like triangles with index of asymmetry y = 2 and index of obliquity z = 0 or z = 1. A141067

Expansion of (1 - x)/(1 + x - 2·x² + x³). A78039

a(n) is the unique odd positive solution·of 2ⁿ = 7x²+y². A77020

Primes with distinct digits in descending order. A52014

a(n) = n-1, if n <= 2, otherwise A107458(n-1) + A107458(n-2). A135851