Properties of the Number 6505

Six Thousand Five Hundred Five

Basics

Value: 6504 → 6505 → 6506

Parity: odd

Prime: No

Previous Prime: 6491

Next Prime: 6521

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 1301

Divisors: 1, 5, 1301, 6505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101101001

Octal: 14551

Duodecimal: 3921

Hexadecimal: 1969

Square: 42315025

Square Root: 80.65358020571685

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 planar simply-connected polyhexes (or benzenoid hydrocarbons) with n hexagons. A18190

Expansion of 1/((1-3·x)*(1-8·x)). A16140

Numbers n such that p(10n) is prime, where p(n) is the number of partitions of n. A114170

Partial sums of A001891. A53808

A Fibonacci convolution triangle. A154929

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having the minimum of its diagonal elements less than the absolute difference of its antidiagonal elements. A251451

Triangle T(n,k), 0<=k<=n, read by rows given by [0,2,-1/2,-1/2,0,0,0,0,0,0,0,0,...] δ [1,0,0,0,0,0,0,0,0,...] where δ is the operator defined in A084938. A155112

Composite squarefree numbers n such that p + τ(n) divides n - φ(n), where p are the prime factors of n, τ(n) = A000005(n) and φ(n) = A000010(n). A229324

Coefficients in the expansion of C⁴/B⁵, in Watson's notation of page 106. A160506

Numbers n such that n through n+4 are divisible by the same number of distinct primes. A45933