Properties of the Number 8581

Eight Thousand Five Hundred Eighty-One

Basics

Value: 8580 → 8581 → 8582

Parity: odd

Prime: Yes

Previous Prime: 8573

Next Prime: 8597

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 8581

Divisors: 1, 8581

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110000101

Octal: 20605

Duodecimal: 4B71

Hexadecimal: 2185

Square: 73633561

Square Root: 92.63368717696602

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: Yes

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Primes of the form j² + (j+1)². A27862

a(n) = 8·n² - 4·n + 1. A80856

Primes of the form x²+101y². A139489

Prime hypotenuses of Pythagorean triangles with a prime leg. A67756

Balanced primes of order five. A96697

Discriminants of real quadratic fields with form class number 3. A391421

a(n) = (11·n² - 11·n + 2)/2. A69125

Lower prime of a pair of consecutive primes having a difference of 16. A31934

a(n) = (prime(n)² + 1)/2. A66885

Numbers k such that σ(2·k-1) is a prime p. A247820