Properties of the Number -2081

Eighty-One

Basics

Value: -2082 → -2081 → -2080

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2081

Divisors: 1, 2081

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100000100001

Octal: -4041

Duodecimal: -1255

Hexadecimal: -821

Square: 4330561

Square Root: 45.617978911828175

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

Primes of the form 2x² + 2xy + 17y². A139827

Prime quadruples: numbers k such that k, k+2, k+6, k+8 are all prime. A7530

Initial members of prime triples (p, p+2, p+6). A22004

Regular triangle read rows: T(n,k) = number of non-isomorphic multiset partitions of size n and length k. A317533

Primes whose decimal representation is a valid number in base 9 and interpreted as such is again a prime. A235395

Numbers that are the sum of 4 positive 5th powers. A3349

Fifth spoke of a hexagonal spiral. A56109

a(n) = 1 + n + 2·n². A84849

Number of partitions of n in which no parts are multiples of 5. A35959

Primes prime(k) for which A049076(k) = 2. A49078