Properties of the Number 31485

Thirty-One Thousand Four Hundred Eighty-Five

Basics

Value: 31484 → 31485 → 31486

Parity: odd

Prime: No

Previous Prime: 31481

Next Prime: 31489

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 2099

Divisors: 1, 3, 5, 15, 2099, 6297, 10495, 31485

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101011111101

Octal: 75375

Duodecimal: 16279

Hexadecimal: 7afd

Square: 991305225

Square Root: 177.44013074837383

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

Expansion of 1/(1 - x³ - x⁴ + x⁷ - x¹⁰ - x¹¹ + x¹⁴) (a Salem polynomial). A143644

n satisfying σ(n+1) = σ(n-1). A55574

Numbers k such that k and 2·k, taken together are pandigital. A115922

Generalized Catalan triangle, called CM(1,2). A116880

Numbers k such that σ(k-1) divides σ(k+1). A67130

Subtriangle of generalized Catalan triangle CM(1,2) = A116880. A116872

Numbers n such that σ(n+1) - σ(n-1) = k·n for some integer k, where σ(n) = A000203 (sum of divisors of n). A223137

Numbers k such that σ(k+1) divides σ(k-1). A227304

G.f.: 1/(1 + (x+x² + x)/(1 + (x+x² + x²)/(1 + (x+x² + x³)/(1 + (x+x² + x⁴)/(1 + ...))))), a continued fraction. A352234

Numbers whose base-7 representation has one fewer 0 than 6's. A31485