Properties of the Number -2185

One Hundred Eighty-Five

Basics

Value: -2186 → -2185 → -2184

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 19 × 23

Divisors: 1, 5, 19, 23, 95, 115, 437, 2185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -100010001001

Octal: -4211

Duodecimal: -1321

Hexadecimal: -889

Square: 4774225

Square Root: 46.74398357008097

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

Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n). A255644

Row sums of triangle A132898. A132899

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 483", based on the 5-celled von Neumann neighborhood. A272346

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449

Generalized 10-gonal numbers: m*(4·m - 3) for m = 0, +- 1, +- 2, +- 3, ... A74377

Second 10-gonal (or decagonal) numbers: n*(4·n+3). A33954

a(n) = (prime(n)² - 1)/24. A24702

The main column of a version of the square spiral. A156859

a(n) = 3ⁿ - 2. A58481

Second pentagonal numbers with even index: a(n) = n*(6·n+1). A49453