Properties of the Number 987

Nine Hundred Eighty-Seven

Basics

Value: 986 → 987 → 988

Parity: odd

Prime: No

Previous Prime: 983

Next Prime: 991

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 47

Divisors: 1, 3, 7, 21, 47, 141, 329, 987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111011011

Octal: 1733

Duodecimal: 6A3

Hexadecimal: 3db

Square: 974169

Square Root: 31.416556144810016

Classification

Fibonacci: Yes

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 numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and F(1) = 1. A45

F(2n) = bisection of Fibonacci sequence: a(n) = 3·a(n-1) - a(n-2). A1906

Number of partitions of n into prime parts. A607

Number of balanced partitions of n: the largest part equals the number of parts. A47993

a(n) = n*(n+5)/2. A55998

a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n² + 5)/6. A4006

a(n+2) = -a(n+1) + a(n) (signed Fibonacci numbers) with a(-2) = a(-1) = 1; or Fibonacci numbers (A000045) extended to negative indices. A39834

a(0) = 1, a(n) = Fibonacci(2·n). It has the property that a(n) = 1·a(n-1) + 2·a(n-2) + 3·a(n-3) + 4·a(n-4) + ... A88305

Expansion of (1 - x)/(1 - x - x²). A212804

a(n) = Fibonacci(3·n + 1). A33887