Properties of the Number 81917

Eighty-One Thousand Nine Hundred Seventeen

Basics

Value: 81916 → 81917 → 81918

Parity: odd

Prime: No

Previous Prime: 81901

Next Prime: 81919

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 11 ² × 677

Divisors: 1, 11, 121, 677, 7447, 81917

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111111101

Octal: 237775

Duodecimal: 3B4A5

Hexadecimal: 13ffd

Square: 6710394889

Square Root: 286.2114602876691

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

Expansion of (1 - x + 3·x²)/((1-x)*(1-2·x)). A154117

Partial sums of A173862. A200672

Let u(1)=u(2)=1, u(3)=n, u(k) = (1/2)*abs(2·u(k-1) -u(k-2)-u(k-3)); sequence gives values of n such that ∑_k>=1 u(k) is an integer. A78113

The number of edges on a piece of paper that has been folded n times (see comments for more precise definition). A133257

Sum of all n-digit Woodall numbers. A131812

a(0)=1, a(n)= n^n-2(7n²-3n+2)/6 (n>0). A81917

Number of n X 4 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 3,1,2,4,0 for x=0,1,2,3,4. A197075

a(n) is the number of iterations of x -> 2·x + 3 until (# composites reached) = (# primes reached), starting with prime(n). A377613