Properties of the Number 9881

Nine Thousand Eight Hundred Eighty-One

Basics

Value: 9880 → 9881 → 9882

Parity: odd

Prime: No

Previous Prime: 9871

Next Prime: 9883

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 41 × 241

Divisors: 1, 41, 241, 9881

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011010011001

Octal: 23231

Duodecimal: 5875

Hexadecimal: 2699

Square: 97634161

Square Root: 99.40321926376429

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

14-gonal (or tetradecagonal) numbers: a(n) = n*(6·n-5). A51866

a(n) = n*(n² - 6·n + 11)/6. A50407

Pseudoprimes to base 5. A5936

a(1) = 1; a(n) = max{ 5·a(k) + a(n-k) | 1 <= k <= n/2 } for n > 1. A130667

Pseudoprimes to base 6. A5937

a(n) = (3 + 2·n + 6·n² + 4·n³)/3. A166464

Expansion of 1/((1-5·x)*(1-8·x)). A16162

Nonprimes n such that 5ⁿ==5 (mod n). A122782

Number of distinct values taken by the entropy for permutations of [1..n], where the entropy of a permutation π is ∑_k=1..n (π(k)-k)². A126972

Number of colors that can be mixed with n >= 0 units of yellow, blue, red. A48241