Properties of the Number -521

Five Hundred Twenty-One

Basics

Value: -522 → -521 → -520

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 521

Divisors: 1, 521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1000001001

Octal: -1011

Duodecimal: -375

Hexadecimal: -209

Square: 271441

Square Root: 22.825424421026653

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

Fibonacci-type sequence based on subtraction: a(0) = 1, a(1) = 2 and a(n) = a(n-2) - a(n-1). A61084

a(0)=-1, a(1)=-1, a(n)=-3·a(n-1)-a(n-2) for n>1. A98149

Alternating sum of diagonals in A060177. A104575

a(n) = A325977(A228058(n)). A389217

Expansion of f(-x²)² * f(-x, x²) / f(x³)³ in powers of·where f(,) is Ramanujan's general θ function. A254525

Expansion of x*(1 - 4·x)^3/2/(3·x - 1)². A320826

Expansion of e.g.f. 1/(exp(x) - x²). A352302

a(n) = n³ - (3*(n+3))². A153259

Triangle read by rows : T(n,0) = n+1, T(n,k)=0 if k<0 or if k>n, T(n,k) = k·T(n-1,k) - T(n-1,k-1). A159881

Expansion of 1 - x*(1+x)/(1 + x²*(1-x²)/(1 - x³*(1+x³)/(1 + x⁴*(1-x⁴)/(1 - x⁵*(1+x⁵)/(1 - ...))))), a continued fraction. A291200