Properties of the Number 2115

Two Thousand One Hundred Fifteen

Basics

Value: 2114 → 2115 → 2116

Parity: odd

Prime: No

Previous Prime: 2113

Next Prime: 2129

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

603 Try Today's Challenge

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

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

a(n) = n² - 2·n. A67998

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

Generalized 22-gonal (or icosidigonal) numbers: m*(10·m - 9) with m = 0, +1, -1, +2, -2, +3, -3, ... A303299

a(n) = 2·n² - 2·n + 3. A97080

a(n) = -a(n-1) - 2·a(n-2). A1607

a(0) = 0, a(1) = 1 and a(n) = n² - 1 with n >= 2. A132411

Number of ways to choose a set partition of a strict integer partition of n. A294617