Properties of the Number -549

Five Hundred Forty-Nine

Basics

Value: -550 → -549 → -548

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 61

Divisors: 1, 3, 9, 61, 183, 549

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1000100101

Octal: -1045

Duodecimal: -399

Hexadecimal: -225

Square: 301401

Square Root: 23.430749027719962

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

a(n) = a(n - 1) - 2·a(n - 2) + a(n - 3) - 2·a(n - 4) + a(n - 5). A122582

Expansion of (1+x)³/((1+x)³+x⁴). A99531

Coefficients of the C-Bailey Mod 9 identity. A104469

Expansion of (1+x²)/(1-x⁴+x⁵). A124746

Expansion of 1/((1-x)sqrt(1-2x+5x²)). A128058

a(n,m) =Floor[N[(-2 + Sqrt[3])ⁿ + (-2 - Sqrt[3])ⁿ]/2^m]. A117809

E.g.f. S(x) satisfies: C(x)² + 2·S(x)² = 1 such that S'(x) = C(x)² - S(x)*C(x) and C'(x) = 2·S(x)² - 2·S(x)*C(x), where C(x) is described by A279841. A279842

Expansion of x * (ψ(x⁶) / ψ(-x³))³ * φ(-x)⁵ / ψ(-x) in powers of·where φ(), ψ() are Ramanujan θ functions. A329651

Expansion of e.g.f. cos(x) * exp(exp(x) - 1). A351745

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058