Properties of the Number -21845

Twenty-One Thousand Eight Hundred Forty-Five

Basics

Value: -21846 → -21845 → -21844

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 17 × 257

Divisors: 1, 5, 17, 85, 257, 1285, 4369, 21845

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101010101010101

Octal: -52525

Duodecimal: -10785

Hexadecimal: -5555

Square: 477204025

Square Root: 147.80054127099805

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

Expansion of 1/((1-x)*(1+2·x)). A77925

Expansion of 1/(1-x+2·x²-2·x³). A77953

Expansion of 1/(1 + x + 2·x² + 2·x³). A77980

Triangle of coefficients of p(x,n) = (1/3)*(1-x)ⁿ⁺¹*∑_{m >= 0} ((5·m+4)ⁿ - (5·m+1)ⁿ)*x^m, read by rows. A154855

Expansion of x / ((1-x)*(4·x²-2·x+1)). A157241

Expansion of (1-x)^-1/(1+2·x³). A77886

A generalized Jacobsthal sequence. A83943

a(n) = -5·a(n-1)-4·a(n-2) with n>1, a(0)=0, a(1)=1. A84241

Expansion of (1+x²)/((1-x+x²)*(1+2·x²)). A102517

Expansion of (1-x³)/((1-x²)*(1+2·x²)). A117576