Properties of the Number 81946

Eighty-One Thousand Nine Hundred Forty-Six

Basics

Value: 81945 → 81946 → 81947

Parity: even

Prime: No

Previous Prime: 81943

Next Prime: 81953

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 40973

Divisors: 1, 2, 40973, 81946

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000000011010

Octal: 240032

Duodecimal: 3B50A

Hexadecimal: 1401a

Square: 6715146916

Square Root: 286.2621176474456

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

G.f. A(x) satisfies: A(x)⁶ = (1-x) * (A(x) + x)⁵. A352415

Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 2 X 2 X 2 subtriangle. A153896

a(n) = ∑_i=1..n floor(r·floor(i/r)), where r=sqrt(2). A81946