Properties of the Number 1801

One Thousand Eight Hundred One

Basics

Value: 1800 → 1801 → 1802

Parity: odd

Prime: Yes

Previous Prime: 1789

Next Prime: 1811

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 1801

Divisors: 1, 1801

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11100001001

Octal: 3411

Duodecimal: 1061

Hexadecimal: 709

Square: 3243601

Square Root: 42.43819034784589

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

Hex (or centered hexagonal) numbers: 3·n*(n+1)+1 (crystal ball sequence for hexagonal lattice). A3215

a(n) = 2·n² + 1. A58331

Primes of the form x²+Ny², with N=102. A139643

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

Primes that become another prime under the map 8 <-> 9 (acting on the decimal digits). A175789

Primes with only nonprime decimal digits. A34844

"Three-quarter squares": a(n) = n² - A002620(n). A77043

Primes of the form x² + 24·y². A107008

Primes of the form x² + 45y². A107152

Cuban primes: primes which are the difference of two consecutive cubes. A2407