Properties of the Number 81916

Eighty-One Thousand Nine Hundred Sixteen

Basics

Value: 81915 → 81916 → 81917

Parity: even

Prime: No

Previous Prime: 81901

Next Prime: 81919

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 20479

Divisors: 1, 2, 4, 20479, 40958, 81916

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: 10011111111111100

Octal: 237774

Duodecimal: 3B4A4

Hexadecimal: 13ffc

Square: 6710231056

Square Root: 286.20971332224207

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) = T(4,n), array T given by A048483. A48487

Start with 1, then alternately add 2 or double. A123208

Expansion of (x - x² + 2·x³ + 2·x⁴)/(1 - 3·x + 2·x²). A270810

a(n) is one fourth of the total number of free ends of 4 line segments expansion at n iterations (see Comments lines for definition). A238549

Number of n X 2 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once. A268775

a(n) = 5ⁿ*(n³ - 3·n² + 2·n + 750)/750. A81916

Array read by antidiagonals: Numerical sequences of Fibonacci-like polynomials produced by m-ary Huffman trees of maximum height for absolutely ordered sequences. A98805