Properties of the Number -4681

Six Hundred Eighty-One

Basics

Value: -4682 → -4681 → -4680

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 31 × 151

Divisors: 1, 31, 151, 4681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1001001001001

Octal: -11111

Duodecimal: -2861

Hexadecimal: -1249

Square: 21911761

Square Root: 68.4178339323893

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

Expansion of 1/(1+x-x²+2·x³). A77972

"Real rabbits": a(n) = Re(c(n)) where complex c(n) = a(n) + i·b(n) and c(0) = i, c(1) = -i, c(n) = c(n-1) + i·c(n-2). A58184

McKay-Thompson series of class 20a for Monster. A58556

Triangle T(n,k) read by rows: the real part of the coefficient [x^k] of (1-x)ⁿ⁺¹ * ∑_s>=0 ((2·s + 1 + 2·i)ⁿ)*x^s, where i is the imaginary unit. A179087

Fermat pseudoprimes to base 2, also called Sarrus numbers or Poulet numbers. A1567

Hex (or centered hexagonal) numbers: 3·n*(n+1)+1 (crystal ball sequence for hexagonal lattice). A3215

sigma₃(n): sum of cubes of divisors of n. A1158

a(n) = (8ⁿ - 1)/7. A23001

Strong pseudoprimes to base 2. A1262

12-gonal (or dodecagonal) numbers: a(n) = n*(5·n-4). A51624