Properties of the Number -2115

One Hundred Fifteen

Basics

Value: -2116 → -2115 → -2114

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 47

Divisors: 1, 3, 5, 9, 15, 45, 47, 141, 235, 423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100001000011

Octal: -4103

Duodecimal: -1283

Hexadecimal: -843

Square: 4473225

Square Root: 45.98912915026767

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

Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2. A107920

Row sums of the Riordan array (1-4·x+4·x², x*(1-2·x)) (A167431). A167433

a(0)=1, a(1)=1; thereafter a(n) = -a(n-1) - 2·a(n-2). A169998

a(n) = (-1)ⁿ*n*(n-2). A131386

a(n) = 5·a(n-1) - 8·a(n-2), with a(0)=0, a(1)=1. A190969

Alternating sum of 12-gonal (or dodecagonal) numbers. A266088

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 371", based on the 5-celled von Neumann neighborhood. A271457

a(n) = n*(n+2) = (n+1)² - 1. A5563

a(n) = 4·n² - 1. A466

Multiples of 15 containing a 15 in their decimal representation. A121035