Properties of the Number 16641

Sixteen Thousand Six Hundred Forty-One

Basics

Value: 16640 → 16641 → 16642

Parity: odd

Prime: No

Previous Prime: 16633

Next Prime: 16649

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 43 ²

Divisors: 1, 3, 9, 43, 129, 387, 1849, 5547, 16641

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100000100000001

Octal: 40401

Duodecimal: 9769

Hexadecimal: 4101

Square: 276922881

Square Root: 129

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

Squares of the squarefree semiprimes (p²*q²). A85986

Numbers that are the sum of 4 positive 7th powers. A3371

a(n) = (4·n + 1)². A16814

a(n) = (3·n)². A16766

Number of 2 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 1 vertically. A207170

a(n) = (6·n+3)². A16946

Odd refactorable numbers. A36896

T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,0 0,2 1,0 or -1,-2. A264364

Square array A(n,k), n>=0, k>=0, read by antidiagonals: A(n,k) is the number of partitions of 2ⁿ into powers of 2 less than or equal to 2^k. A152977

Centered 4-dimensional orthoplex numbers (crystal ball sequence for 4-dimensional cubic lattice). A1846