Properties of the Number 6581

Six Thousand Five Hundred Eighty-One

Basics

Value: 6580 → 6581 → 6582

Parity: odd

Prime: Yes

Previous Prime: 6577

Next Prime: 6599

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 6581

Divisors: 1, 6581

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100110110101

Octal: 14665

Duodecimal: 3985

Hexadecimal: 19b5

Square: 43309561

Square Root: 81.12336284942828

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

Numbers k such that (27^k - 2^k)/25 is prime. A377031

Difference between the arithmetic mean of the neighbors of the terms and the term itself follows the pattern 0,1,2,3,4,5,... A86514

Minimal number (in decimal representation) with n nonprime substrings in base-9 representation (substrings with leading zeros are considered to be nonprime). A217109

Lower prime of a difference of 18 between consecutive primes. A31936

Primes p whose period of reciprocal equals (p-1)/5. A56210

Primes of the form 23n+3. A100201

Primes p such that the multiplicative order of 2 modulo p is (p-1)/5. A1135

Least prime in A031936 (lesser of 18-twins) whose distance to the next 18-twin is 2·n. A52358

Primes that remain prime when a single "8" digit is inserted between any two adjacent digits. A217047

Solution to the non-squashing boxes problem (version 1). A89054