Properties of the Number -1087

Eighty-Seven

Basics

Value: -1088 → -1087 → -1086

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 1087

Divisors: 1, 1087

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10000111111

Octal: -2077

Duodecimal: -767

Hexadecimal: -43f

Square: 1181569

Square Root: 32.96968304366907

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) = (-4·n³ + 27·n² - 20·n + 3)/3. A161711

Expansion of q * χ(-q) / χ(-q⁵)⁵ in powers of q where χ() is a Ramanujan θ function. A95813

First column in inverse of Euler φ sequence matrix. A106479

Expansion of f(q, q³)² / (f(q, q⁴) * f(q², q³)) in powers of q where f(, ) is the Ramanujan general θ function. A138522

Expansion of (1-5·x-x²+x³)/((1+x)*(1-x)³). A141354

Expansion of f(-x, -x⁵)² / f(x, x³) in powers of·where f(, ) is Ramanujan's general θ function. A263041

a(n) = 1 - 4·n - 4·n². A184882

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 65", based on the 5-celled von Neumann neighborhood. A270086

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 323", based on the 5-celled von Neumann neighborhood. A271256

a(n) = p(n) - p(n-1) - p(n-2) + p(n-5), where p(n) = A000041(n). A195054