Properties of the Number 2180

Two Thousand One Hundred Eighty

Basics

Value: 2179 → 2180 → 2181

Parity: even

Prime: No

Previous Prime: 2179

Next Prime: 2203

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 109

Divisors: 1, 2, 4, 5, 10, 20, 109, 218, 436, 545

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100010000100

Octal: 4204

Duodecimal: 1318

Hexadecimal: 884

Square: 4752400

Square Root: 46.69047011971501

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

Rao Uppuluri-Carpenter numbers (or complementary Bell numbers): e.g.f. = exp(1 - exp(x)). A587

Number of points on surface of tetrahedron; coordination sequence for sodalite net (equals 2·n²+2 for n > 0). A5893

a(1) = 1 and a(n) = ceiling((∑_k=1..n-1 a(k))/3) for n >= 2. A72493

Twice partitioned numbers where the first partition is strict. A271619

Snowflake (or E-toothpick) sequence (see Comments lines for definition). A161330

E.g.f.: exp(1 + x - exp(x)). A293037

Numbers m such that there are precisely 15 groups of order m. A294156

Expansion of e.g.f. exp(1-x-exp(-x)). A14182

Numbers n such that n is a substring of its square when both are written in base 2. A18826

a(n) = 3ⁿ - n. A24024