Properties of the Number -8641

Six Hundred Forty-One

Basics

Value: -8642 → -8641 → -8640

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

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

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

a(n) = -a(n-1) - 2·a(n-2). A1607

Expansion of (1 + 2·x)/(1 + 3·x + 4·x²). A87168

Row sums of the Riordan array (1-4·x+4·x², x*(1-2·x)) (A167431). A167433

a(n) = 3·a(n-1) - 4·a(n-2) with a(0) = a(1) = 1. A247560

Expansion of (2 + x + x² + x³ - x⁴ - 2·x⁵ - 4·x⁶ - 8·x⁷) / (1 - x⁴ + 16·x⁸) in powers of x. A247487

G.f.: 1/(1+x+x³). A199804

a(n) = 3·a(n-2) - 4·a(n-4) with a(0) = 2, a(1) = 1, a(2) = 3, a(3) = 1. A247564

a(0) = -1, otherwise a(n) = (-1)ⁿ*(n³ - 15·n² + 2·n - 12)/6. A173248

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