Properties of the Number -6781

Seven Hundred Eighty-One

Basics

Value: -6782 → -6781 → -6780

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 6781

Divisors: 1, 6781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1101001111101

Octal: -15175

Duodecimal: -3B11

Hexadecimal: -1a7d

Square: 45981961

Square Root: 82.34682750416071

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

a(n) = 5·a(n-2) + 2·a(n-3). A135949

Balanced primes of order five. A96697

Number of partitions of n such that 2*(least part) <= greatest part. A237821

Primes such that the sum of the predecessor and successor primes is divisible by 23. A112847

Primes p whose period of reciprocal equals (p-1)/5. A56210

Positions of ones in A264977; positions of twos in A277330. A277701

Largest prime factor of 6ⁿ - 1. A274907

Greatest prime factor of n⁵ + 1. A240548

Greatest prime factor of n¹⁰+1. A240553

Primes which are the sum of a twin prime pair + 1. A118071