Properties of the Number -2090

Ninety

Basics

Value: -2091 → -2090 → -2089

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 × 11 × 19

Divisors: 1, 2, 5, 10, 11, 19, 22, 38, 55, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100000101010

Octal: -4052

Duodecimal: -1262

Hexadecimal: -82a

Square: 4368100

Square Root: 45.71651780264984

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) = 2*σ(n²) - σ(n)². A195735

Difference between sums of quadratic residues and non-residues modulo n that are coprime to n. A255643

G.f.: 1/(1 + (x + x)/(1 + (x + x²)/(1 + (x + x³)/(1 + (x + x⁴)/(1 ...))))), a continued fraction. A352076

a(n) = -n² - n + 72. A110678

a(n) = (-1)ⁿ*n*(n+1)*(2·n-5)/6. A167386

Expansion of (1+4·x+x²) / ((1-x)³*(1+x)⁴). A229834

Balanced numbers: numbers k such that φ(k) (A000010) divides σ(k) (A000203). A20492

Primitive abundant numbers (abundant numbers all of whose proper divisors are deficient numbers). A71395

Numbers k such that the k-th composition in standard order (row k of A066099) has all equal run-sums. A353848

Primitive nondeficient numbers. A6039