Properties of the Number -209

Two Hundred Nine

Basics

Value: -210 → -209 → -208

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 11 × 19

Divisors: 1, 11, 19, 209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11010001

Octal: -321

Duodecimal: -155

Hexadecimal: -d1

Square: 43681

Square Root: 14.45683229480096

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) = (n+1)*(2-n)/2. A80956

Expansion of ∏_k>=1 (1 - x^k)¹². A735

Coefficient of xⁿ in (∏_m=1..n(1-x^m))ⁿ. A8705

Unique attractor for (RIGHT then MOBIUS) transform. A7554

Image of partition numbers (A000041) under "little Hankel" transform that sends [c₀, c₁, ...] to [d₀, d₁, ...] where d_n = c_n² - c_n+1*c_n-1. A56222

Row sums of a number triangle related to the Pell numbers. A110331

Expansion of g.f. 1+x+(1+3·x+x²)/(1+x)³. A201163

Square array A(n, k) = A246278(1+n, k) - 2·A246278(n, k), read by falling antidiagonals, where A246278 is the prime shift array. A372562

Expansion of ∏_k>=1 (1 - x^k/(1 - x)). A307599

a(n) = -A001353(n). A106707