Properties of the Number -2165

One Hundred Sixty-Five

Basics

Value: -2166 → -2165 → -2164

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 433

Divisors: 1, 5, 433, 2165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100001110101

Octal: -4165

Duodecimal: -1305

Hexadecimal: -875

Square: 4687225

Square Root: 46.52956049652737

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

Triangle read by rows: coefficients of polynomials arising from the recurrence A[n](x) = A[n-1]'(x)/(1-x) with A[0] = exp(x). A144505

Values of n such that L(6) and N(6) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A226926

a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n - 1) - 2·a(n - 2) + a(n - 3). A121311

Coordination sequence for "hal" 3D uniform tiling. A299274

a(n) = largest number of distinct words arising in Post's tag system {00, 1101} applied to a binary word w, over all starting words w of length n, or a(n) = -1 if there is a word w with an unbounded trajectory. A284116

a(n) = n² + n + 3. A27688

a(n) = 6·n² - 1. A140811

T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4. A239405

5-Knödel numbers. A50993

Numbers k > 1 such that, in base 4, k and k² contain the same digits in the same proportion. A61658