Properties of the Number 6621

Six Thousand Six Hundred Twenty-One

Basics

Value: 6620 → 6621 → 6622

Parity: odd

Prime: No

Previous Prime: 6619

Next Prime: 6637

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 2207

Divisors: 1, 3, 2207, 6621

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100111011101

Octal: 14735

Duodecimal: 39B9

Hexadecimal: 19dd

Square: 43837641

Square Root: 81.36952746575342

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 flat partitions of n: partitions {a_i} with each |a_i - a_i-1| <= 1. A34296

Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24. A51965

The Wiener index of a benzenoid consisting of a linear chain of n hexagons. A143938

O.g.f. A(x) satisfies: 0 = [xⁿ] exp( n² * Integral A(x)³ dx ) / A(x), for n > 0. A305141

Number of ordered pairs of integers (x,y) with x²+y² < n². A51132

a(1) = 3; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime. A74339

Products of distinct terms of A001566: a(n) = ∏_{i=0..floor(log₂(n+1))} L(2ⁱ⁺¹)^bit(n,i). A50614

Minimum number of points of the square lattice falling strictly inside a circle of radius n. A291259

Let S be the sequence Fibonacci(2n), n>0 (cf. A001906); sequence lists the differences S(j)-S(i) for i<j. A169690

Fibonacci sequence beginning 3, 9. A22379