Properties of the Number 81693

Eighty-One Thousand Six Hundred Ninety-Three

Basics

Value: 81692 → 81693 → 81694

Parity: odd

Prime: No

Previous Prime: 81689

Next Prime: 81701

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 29 × 313

Divisors: 1, 3, 9, 29, 87, 261, 313, 939, 2817, 9077

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100011101

Octal: 237435

Duodecimal: 3B339

Hexadecimal: 13f1d

Square: 6673746249

Square Root: 285.8198733468336

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

Numbers k that can be expressed as k = w+x = y·z with w·x = (y+z)² where w, x, y, and z are all positive integers. A57369

Structured octagonal anti-diamond numbers (vertex structure 7). A100187

For the numbers k that can be expressed as k = w + x = y·z with w·x = y² + z² where w, x, y, and z are all positive integers, this sequence gives the corresponding values of w·x. A57444

First index k where A366574(k) = n. A366724

Define two sequences by A_n = mex{A_i,B_i : 0 <= i < n}, B_n = B_n-1 + (A_n-A_n-1)(A_n-A_n-1+1), where the mex of a set is the smallest nonnegative integer not in the set. Sequence gives B_n. A_n is in A081692. A81693