Properties of the Number 81206

Eighty-One Thousand Two Hundred Six

Basics

Value: 81205 → 81206 → 81207

Parity: even

Prime: No

Previous Prime: 81203

Next Prime: 81223

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 19 × 2137

Divisors: 1, 2, 19, 38, 2137, 4274, 40603, 81206

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110100110110

Octal: 236466

Duodecimal: 3ABB2

Hexadecimal: 13d36

Square: 6594414436

Square Root: 284.9666647171209

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

a(n) = 225·n² - n. A156813

a(n) = 361·n² - 19. A158595

Number of 3 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically. A207961

Expansion of ∏_k>=1 (1+x^k)^k / (1-x^k). A262667

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically. A208164

A sequence relating to the rational values ζ(2n)²/ζ(4n), which are expressible in terms of Bernoulli's numbers (see comments for definition of the sequence). A217926

Correlation matrix of triangle A046854. A81206