Properties of the Number 321

Three Hundred Twenty-One

Basics

Value: 320 → 321 → 322

Parity: odd

Prime: No

Previous Prime: 317

Next Prime: 331

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 107

Divisors: 1, 3, 107, 321

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001

Octal: 501

Duodecimal: 229

Hexadecimal: 141

Square: 103041

Square Root: 17.916472867168917

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

Moser-de Bruijn sequence: sums of distinct powers of 4. A695

Numbers in base 4. A7090

Integers written in factorial base. A7623

Central Delannoy numbers: a(n) = ∑_k=0..n C(n,k)*C(n+k,k). A1850

n written in primorial base. A49345

Square array of Delannoy numbers D(i,j) (i >= 0, j >= 0) read by antidiagonals. A8288

a(n) = 6·n+3. A16945

Concatenation of numbers from n down to 1. A422

a(n) = 10·n + 1. A17281

a(n) = (n-1)*2ⁿ + 1. A337

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