Properties of the Number -81005

Eighty-One Thousand Five

Basics

Value: -81006 → -81005 → -81004

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 17 × 953

Divisors: 1, 5, 17, 85, 953, 4765, 16201, 81005

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011110001101101

Octal: -236155

Duodecimal: -3AA65

Hexadecimal: -13c6d

Square: 6561810025

Square Root: 284.6137733842127

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

Triangle read by rows: CP(n,i) for n>=0 and 3n+1 >= i >= 0, gives the absolute value of the coefficients of the chromatic polynomial of C₃ X P_n+1 factored in the form x(x-1)ⁱ. A123531

Strong pseudoprimes to base 98. A20324

Number of nondecreasing arrangements of n+2 numbers in 0..4 with each number being the sum mod 5 of two others. A183907