Properties of the Number 985

Nine Hundred Eighty-Five

Basics

Value: 984 → 985 → 986

Parity: odd

Prime: No

Previous Prime: 983

Next Prime: 991

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 197

Divisors: 1, 5, 197, 985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111011001

Octal: 1731

Duodecimal: 6A1

Hexadecimal: 3d9

Square: 970225

Square Root: 31.38470965295043

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

Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2·a(n-1) + a(n-2). A129

Number of partitions of n into an odd number of parts. A27193

Numbers k such that 2·k² - 1 is a square. A1653

a(n) = floor(3ⁿ / 2ⁿ). A2379

Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity). A6753

a(n) = Fibonacci(n+3) - 2. A1911

Number of integer partitions of n with reverse-alternating sum >= 0. A344607

Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x² + y² + z² = 3·x*y·z. A2559

Table by antidiagonals of T(n,k) = n·T(n,k-1) + T(n,k-2) starting with T(n,1) = 1. A73133

Array A(n,k) = n·A(n,k-1) + A(n,k-2) read by upward antidiagonals, starting A(n,0) = 0, A(n,1) = 1. A172236