Properties of the Number 9919

Nine Thousand Nine Hundred Nineteen

Basics

Value: 9918 → 9919 → 9920

Parity: odd

Prime: No

Previous Prime: 9907

Next Prime: 9923

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 7 × 13 × 109

Divisors: 1, 7, 13, 91, 109, 763, 1417, 9919

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011010111111

Octal: 23277

Duodecimal: 58A7

Hexadecimal: 26bf

Square: 98386561

Square Root: 99.5941765365827

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

Centered octahedral numbers (crystal ball sequence for cubic lattice). A1845

a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n² + 5)/6. A4006

a(n) is the solution to the postage stamp problem with 4 denominations and n stamps. A1209

a(n) = ∑_k=0..n C(n-k, floor(k/2)). A97333

Numbers in which 9 outnumbers all other digits together. A292739

Numbers k such that 3^k + 22 is prime. A219042

Expansion of (1+x)(1+x²)/(1-x-x³). A3410

Differences between two positive cubes in exactly 2 ways. A14440

Expansion of (1 - x²)/(1 - x - x³). A58278

Difference between two positive cubes in more than one way. A34179