Properties of the Number 81723

Eighty-One Thousand Seven Hundred Twenty-Three

Basics

Value: 81722 → 81723 → 81724

Parity: odd

Prime: No

Previous Prime: 81707

Next Prime: 81727

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 27241

Divisors: 1, 3, 27241, 81723

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100111011

Octal: 237473

Duodecimal: 3B363

Hexadecimal: 13f3b

Square: 6678648729

Square Root: 285.87234913506416

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

Odd numbers n divisible by 3 such that for all k >= 1 the numbers n·2^k + 1 and n·2^k+1 + 1 do not form a pair of primes. A243857

Let b(n)=floor((3/2)ⁿ), c(n)=floor((4/3)ⁿ); sequence gives values of k such that b(k+1) / b(k) = 3/2 and c(k+1) / c(k) = 4/3. A81723