Properties of the Number 19641

Nineteen Thousand Six Hundred Forty-One

Basics

Value: 19640 → 19641 → 19642

Parity: odd

Prime: No

Previous Prime: 19609

Next Prime: 19661

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 6547

Divisors: 1, 3, 6547, 19641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100110010111001

Octal: 46271

Duodecimal: B449

Hexadecimal: 4cb9

Square: 385768881

Square Root: 140.14635207525026

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

T(n,k)=Number of nXk 0..2 arrays with the row and column sums nondecreasing. A203330

[s(k)-s(j)]/10, where the pairs (k,j) are given by A205877 and A205878, and s(k) denotes the (k+1)-st Fibonacci number. A205880

Consider any concatenation of the type n = concat(a,b). Sequence lists numbers that are the sum of the products of some of such couples a and b. A265737

One seventh of the sum of the first n primes, when an integer. A112272

Number of nX2 0..2 arrays with the row and column sums nondecreasing. A203324

Least k > 1 such that φ(k·n-1) = φ(k·n+1), or -1 if no such k exists. A276052

Least k such that φ(k·n-1) = φ(k·n+1), or -1 if no such k exists. A276373

Number of permutations of length n which avoid the patterns 1234, 2143, 3421. A116842

Number of planar n X n X n binary triangular grids with no more than 4 ones in any 3 X 3 X 3 subtriangle. A153525

Number of ways to place two non-attacking queens on all free n-ominoes. A171009