Properties of the Number 51661

Fifty-One Thousand Six Hundred Sixty-One

Basics

Value: 51660 → 51661 → 51662

Parity: odd

Prime: No

Previous Prime: 51659

Next Prime: 51673

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 19 × 2719

Divisors: 1, 19, 2719, 51661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1100100111001101

Octal: 144715

Duodecimal: 25A91

Hexadecimal: c9cd

Square: 2668858921

Square Root: 227.29056293651965

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 intersection points of all lines through pairs of vertices of a regular n-gon. A146212

a(n) = n³ + 4·n² - 5·n + 1. A241577

Number of vertices in graph G_n formed by taking a regular n-gon with all its chords extended to infinity (the n-th graph in A344857) and inverting it in its circumscribing circle. A383461

Strong pseudoprimes to base 59. A20285

Frobenius number of the numerical semigroup generated by three consecutive pyramidal numbers. A69762

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 157", based on the 5-celled von Neumann neighborhood. A270331

A146212(2·n). A347321

Numbers having four 7's in base 9. A43484

Experimental values for number of circles in packing equal circles into a square for which there are no loose circles. A51661