Properties of the Number -8281

Two Hundred Eighty-One

Basics

Value: -8282 → -8281 → -8280

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 ² × 13 ²

Divisors: 1, 7, 13, 49, 91, 169, 637, 1183, 8281

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10000001011001

Octal: -20131

Duodecimal: -4961

Hexadecimal: -2059

Square: 68574961

Square Root: 91

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

Alternating sum of cubes, i.e., ∑_k=0..n k^p*q^k for p=3, q=-1. A232599

a(n) is the minimal determinant of an n X n symmetric Toeplitz matrix having 0 on the main diagonal and all the integers 1, 2, ..., n-1 off-diagonal. A374279

a(n) = ∑_{k=0..floor(n/10)} (-1)^k * binomial(n-5·k,5·k). A348310

Odd squares: a(n) = (2n+1)². Also centered octagonal numbers. A16754

Sum of first n cubes; or n-th triangular number squared. A537

Squares of the squarefree semiprimes (p²*q²). A85986

a(n) = σ(n)². A72861

Powers of composite squarefree numbers that are not squarefree. A303606

a(n) = (3·n+1)². A16778

a(n) = (6·n + 1)². A16922