Properties of the Number -81971

Eighty-One Thousand Nine Hundred Seventy-One

Basics

Value: -81972 → -81971 → -81970

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 81971

Divisors: 1, 81971

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: -10100000000110011

Octal: -240063

Duodecimal: -3B52B

Hexadecimal: -14033

Square: 6719244841

Square Root: 286.30578059131113

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

Values of k such that k² + 9 is a triangular number (A000217). A276601

Expansion of (3+3·x-25·x²-3·x³+2·x⁴)/((1-x)*(1-10·x²+x⁴)). A180483

Primes p such that p + 2, 18·p² + 1, and 18*(p+2)² + 1 are all primes. A115272

Numbers k such that F(k)*F(k+1) - F(k+2) is prime, where F = A000045. A305415