Properties of the Number -321

Three Hundred Twenty-One

Basics

Value: -322 → -321 → -320

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

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

Today's Target

8509 Try Today's Challenge

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

First differences of A014292. A104862

First column of triangle A103364, which equals the matrix inverse of the Narayana triangle (A001263). A103365

Matrix inverse of the Narayana triangle A001263. A103364

Sum(μ(i)*σ(j): i+j=n), with μ=A008683 and σ=A000203. A112964

Triangle T(n,k) = (-1)^k * A119258(n,k) read by rows, 0 <= k <= n. A145661

Expansion of r(q³) / r(q)³ in powers of q where r() is the Rogers-Ramanujan continued fraction. A285583

Inverse binomial transform of A026007. A294503

Spontaneous magnetization coefficients for square lattice spin 3/2 Ising model. A10105

Expansion of (1 - 2·x²)/(1 + x)³. Second column of Riordan triangle A248156. A248158

a(1) = -1, for n > 1, a(n) = ∑_{d∣n, d<n} A340197(n/d) * a(d). A340140