Properties of the Number 81006

Eighty-One Thousand Six

Basics

Value: 81005 → 81006 → 81007

Parity: even

Prime: No

Previous Prime: 81001

Next Prime: 81013

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 23 × 587

Divisors: 1, 2, 3, 6, 23, 46, 69, 138, 587, 1174

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110001101110

Octal: 236156

Duodecimal: 3AA66

Hexadecimal: 13c6e

Square: 6561972036

Square Root: 284.6155301454929

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

Greatest integer k such that k/2ⁿ < 1/φ, where φ = (1+sqrt(5))/2 = golden ratio. A293322

a(n) = n(n+7)(n+1)(n²+2n+12)/120. A51746

a(n) = Fibonacci(4n) - 1, or Fibonacci(2n+1)*Lucas(2n-1). A81006