Properties of the Number 65521

Sixty-Five Thousand Five Hundred Twenty-One

Basics

Value: 65520 → 65521 → 65522

Parity: odd

Prime: Yes

Previous Prime: 65519

Next Prime: 65537

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 65521

Divisors: 1, 65521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111111111110001

Octal: 177761

Duodecimal: 31B01

Hexadecimal: fff1

Square: 4293001441

Square Root: 255.9707014484275

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

Largest prime <= 2ⁿ. A14234

Primes of the form 2·p² - 1, where p is prime. A92057

Let j be the smallest integer for which 1+(1+1·n)+(1+2·n)+...+(1+j·n)=k²=s. Then a(n)=1+j·n; if no such j exists, then a(n)=0. A100253

Row sums of triangle A132044. A132045

Numbers k such that the root-mean-square value of 1, 2, ..., k, i.e., sqrt((1/k)*∑_j=1..k j²), is an integer. A84231

a(n) = 2ⁿ⁺¹ - n. A95768

Primes of the form 2^k - k + 1. A100362

Largest prime factor of the odd Catalan number A038003(n). A120274

a(n) = Fibonacci(n) OR Fibonacci(n+1). A51123

a(n) = 1 + ∏_k=1..n Fibonacci(k). A52449