Properties of the Number 1266

One Thousand Two Hundred Sixty-Six

Basics

Value: 1265 → 1266 → 1267

Parity: even

Prime: No

Previous Prime: 1259

Next Prime: 1277

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 211

Divisors: 1, 2, 3, 6, 211, 422, 633, 1266

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110010

Octal: 2362

Duodecimal: 896

Hexadecimal: 4f2

Square: 1602756

Square Root: 35.58089374931439

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

Number of rooted trees with n vertices in which vertices at the same level have the same degree. A3238

Centered pentagonal numbers: (5n²+5n+2)/2; crystal ball sequence for 3.3.3.4.4. planar net. A5891

Numbers which are the sum of 3 nonzero 4th powers. A3337

Numbers k such that both k and k + 1 are Niven numbers in base 2 (A049445). A330931

Numbers m such that the Bernoulli number B_m has denominator 42. A51228

Generalized 21-gonal (or icosihenagonal) numbers: m*(19·m - 17)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303298

Numbers k whose abundance is 12: σ(k) - 2·k = 12. A141545

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of ∏_j>=1 (1 + j·x^j)^k. A297321

(Prime(n)# - 4)/2 is prime, where x# is the primorial A034386(x). A67026

Shifts 2 places left under binomial transform. A994