Properties of the Number 6441

Six Thousand Four Hundred Forty-One

Basics

Value: 6440 → 6441 → 6442

Parity: odd

Prime: No

Previous Prime: 6427

Next Prime: 6449

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 19 × 113

Divisors: 1, 3, 19, 57, 113, 339, 2147, 6441

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 1100100101001

Octal: 14451

Duodecimal: 3889

Hexadecimal: 1929

Square: 41486481

Square Root: 80.25584090893322

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

Triangular numbers (A000217) with prime indices. A34953

Fifth spoke of a hexagonal spiral. A56109

a(n) = 4·n² - 7·n + 4. A54567

3 times pentagonal numbers: 3·n*(3·n-1)/2. A62741

a(n) = (2·n+1)*(4·n+1). A14634

G.f.: (1-2·x*c(x))/(1-3·x*c(x)) where c(x) = (1 - sqrt(1-4·x))/(2·x) is the g.f. for Catalan numbers A000108. A49027

Number T(n,k) of entries in the k-th cycles of all permutations of [n] when cycles are ordered by increasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows. A322383

Special polygonal numbers. A324973

NSW pseudoprimes: odd composite numbers k such that A002315((k-1)/2) == 1 (mod k). A330276

Triangular numbers that are products of three distinct primes. A128896