Properties of the Number 81804

Eighty-One Thousand Eight Hundred Four

Basics

Value: 81803 → 81804 → 81805

Parity: even

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 17 × 401

Divisors: 1, 2, 3, 4, 6, 12, 17, 34, 51, 68

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111110001100

Octal: 237614

Duodecimal: 3B410

Hexadecimal: 13f8c

Square: 6691894416

Square Root: 286.01398567202966

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) = ( 1 + x/(1 - x·A(x)^2/3) )³. A378801

Number of (7+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A258560

Union of S, 2S and 4S, where S = odd squarefree numbers (A056911). A78779

Hypotenuses of primitive Pythagorean triangles sorted on semiperimeter. A81804

Union of {8, 9, 18}, S, 2S and 4S, where S = odd squarefree numbers (A056911). A121684