Properties of the Number 1287

One Thousand Two Hundred Eighty-Seven

Basics

Value: 1286 → 1287 → 1288

Parity: odd

Prime: No

Previous Prime: 1283

Next Prime: 1289

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 11 × 13

Divisors: 1, 3, 9, 11, 13, 33, 39, 99, 117, 143

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000111

Octal: 2407

Duodecimal: 8B3

Hexadecimal: 507

Square: 1656369

Square Root: 35.874782229304195

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

Binomial coefficients C(n,5). A389

Binomial coefficient C(2n+1, n-1). A2054

Triangular array formed by taking every other term of each row of Pascal's triangle. A34839

Triangle read by rows: T(n, k) = binomial(n + k, 2·k). A85478

a(n) = binomial coefficient C(n,8). A581

Triangle read by rows: T(n, k) = binomial(n+k-1, 2·k-1). A78812

a(n) = n*(n + 6). A28560

Sum of 12 nonzero 8th powers. A3390

Triangle read by rows: T(n, k) is the number of diagonal dissections of a convex n-gon into k+1 regions. A33282

Triangle of coefficients of Chebyshev's S(n,x-2) = U(n,x/2-1) polynomials (exponents of·in increasing order). A53122