Properties of the Number -9681

Six Hundred Eighty-One

Basics

Value: -9682 → -9681 → -9680

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 461

Divisors: 1, 3, 7, 21, 461, 1383, 3227, 9681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

9108 Try Today's Challenge

Representations

Binary: -10010111010001

Octal: -22721

Duodecimal: -5729

Hexadecimal: -25d1

Square: 93721761

Square Root: 98.39207285142437

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

T(j,k) are the numerators s in the representation R = s/t + (2/π)*u/v of the resistance between two nodes separated by the distance vector (j,k) in an infinite square lattice of one-ohm resistors, where T(j,k), j >= 0, 0 <= k <= j, is a triangle read by rows. A355565

G.f. A(x) satisfies A(x) = ( 1 + 9·x/(1 - x·A(x)) )^1/3. A372017

Diagonal in array of n-gonal numbers A081422. A81437

a(n) = n*(11·n - 1)/2. A22268

T(n,k)=Number of nXk 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. A224158

E.g.f. satisfies: A(x) = exp( x/(1 - x·A(x)³) ). A212917

G.f.: ∑_{n >= 1} xⁿ/(1-xⁿ)⁵. A73570

G.f. A(x) satisfies A(x) = 1 + x*(1 + x)⁴*A(x)⁵. A366273

a(n) = n*(9·n + 25)/2 + 6. A235332

The number of n-almost primes less than or equal to eⁿ, starting with a(0)=1. A116432