Properties of the Number 65281

Sixty-Five Thousand Two Hundred Eighty-One

Basics

Value: 65280 → 65281 → 65282

Parity: odd

Prime: No

Previous Prime: 65269

Next Prime: 65287

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 97 × 673

Divisors: 1, 97, 673, 65281

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111111100000001

Octal: 177401

Duodecimal: 31941

Hexadecimal: ff01

Square: 4261608961

Square Root: 255.50146770615623

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

Strong pseudoprimes to base 2. A1262

Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2). A141232

Euler-Jacobi pseudoprimes: 2^(n-1/2) == (2 / n) mod n, where (2 / n) is a Jacobi symbol. A47713

Super-Poulet numbers: Poulet numbers whose divisors d all satisfy d∣2^d-2. A50217

A 9th-order Fibonacci sequence. A127193

a(n) = 4ⁿ - 2ⁿ + 1. A20515

Composite numbers k such that k == +-1 (mod 8) and 2^(k-1/2) == 1 (mod k). A6971

Fermat pseudoprimes to base 2 with two prime factors. A214305

Zsigmondy numbers for a = 4, b = 1: Zs(n, 4, 1) is the greatest divisor of 4ⁿ - 1ⁿ (A024036) that is relatively prime to 4^m - 1^m for all positive integers m < n. A64080

Strong pseudoprimes to base 4. A20230