Properties of the Number 81709

Eighty-One Thousand Seven Hundred Nine

Basics

Value: 81708 → 81709 → 81710

Parity: odd

Prime: No

Previous Prime: 81707

Next Prime: 81727

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 101 × 809

Divisors: 1, 101, 809, 81709

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100101101

Octal: 237455

Duodecimal: 3B351

Hexadecimal: 13f2d

Square: 6676360681

Square Root: 285.84786163272236

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

Start with a single square; at n-th generation add a square at each expandable vertex (this is the "vertex to side" version); a(n) is the sum of all label values at n-th generation. (See comment for construction rules.) A247903

Composite numbers n such that every divisor of n greater than one contains the digit 0. A243819

Centered cubohemioctahedral numbers: a(n) = 2·n³+9·n²+n+1. A274973

Numbers k such that (8·10^k - 611)/9 is prime. A295399

a(n) = sum of numbers formed using the digits of next n numbers. A81993

Decimal expansion of lim_i->infinity ∏_j=2..i γ(j+ζ(j+1)) / γ(j+ζ(j)). A81709