Properties of the Number 82181

Eighty-Two Thousand One Hundred Eighty-One

Basics

Value: 82180 → 82181 → 82182

Parity: odd

Prime: No

Previous Prime: 82171

Next Prime: 82183

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 31 × 241

Divisors: 1, 11, 31, 241, 341, 2651, 7471, 82181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000100000101

Octal: 240405

Duodecimal: 3B685

Hexadecimal: 14105

Square: 6753716761

Square Root: 286.6722867666144

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(0) = 1, for n>=1, a(n) = ∑_k=0..n 9^k*N(n,k), where N(n,k) = (1/n)*C(n,k)*C(n,k+1) are the Narayana numbers (A001263). A82181

Number of nX4 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4. A197533