Properties of the Number 12811

Twelve Thousand Eight Hundred Eleven

Basics

Value: 12810 → 12811 → 12812

Parity: odd

Prime: No

Previous Prime: 12809

Next Prime: 12821

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 23 × 557

Divisors: 1, 23, 557, 12811

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001000001011

Octal: 31013

Duodecimal: 74B7

Hexadecimal: 320b

Square: 164121721

Square Root: 113.18568814121333

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

Partial sums of A299272. A299273

Number of prime powers (p², p³, ...) <= 2ⁿ. A36386

Numbers k such that τ(k) = τ(k+1) mod 691, where τ is Ramanujan's τ function A000594. A121733

a(n) = n! * ∑_{k=0..floor(n/2)} (n - 2·k)^k/(n - 2·k)!. A356628

Numbers n of the form k + reverse(k) for exactly two k. A72040

Numbers k such that the continued fraction for sqrt(k) has period 100. A20439

The largest number m such that σ(m) = A007368(n), where A007368(n) = the smallest k such that σ(x) = k has exactly n solutions. A184394

Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=n-w+|y-z|. A212684

Partial sums of A007202 (crystal ball sequence for hexagonal close-packing). A186707

Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers. A256354