Properties of the Number 65221

Sixty-Five Thousand Two Hundred Twenty-One

Basics

Value: 65220 → 65221 → 65222

Parity: odd

Prime: No

Previous Prime: 65213

Next Prime: 65239

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 13 × 29 × 173

Divisors: 1, 13, 29, 173, 377, 2249, 5017, 65221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111111011000101

Octal: 177305

Duodecimal: 318B1

Hexadecimal: fec5

Square: 4253778841

Square Root: 255.38402455909414

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 forests of trees on n or fewer nodes using a subset of labels 1..n, also row sums of triangle A144258. A144259

a(0) = 1, a(1) = 2; for n>0, a(2·n) = 3·a(2·n-1) - a(2·n-2), a(2·n+1) = 3·a(2·n) - a(2·n-1) - a(n-1). A129804

Triangle read by rows: row n gives coefficients of expansion of q-reduced tangent number d_n(q) in powers of q. A143195

Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the pentagonal numbers. The final elements of the rows form a(n). A65221