Properties of the Number -21791

Twenty-One Thousand Seven Hundred Ninety-One

Basics

Value: -21792 → -21791 → -21790

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 11 × 283

Divisors: 1, 7, 11, 77, 283, 1981, 3113, 21791

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101010100011111

Octal: -52437

Duodecimal: -1073B

Hexadecimal: -551f

Square: 474847681

Square Root: 147.61774961026876

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

a(n) = n*(n+1)*(14·n-11)/6. A172076

Structured deltoidal hexacontahedral numbers (vertex structure 9). A100166

Matrix log of triangle A117396. A117398

Numbers n such that the Collatz iterations for n and n + 1 have the same length (A078417) but do not meet a certain condition. (See comments.) A274410

Positive numbers k such that k and k + 1 are both positive negaFibonacci-Niven numbers (A331085) and -k and -(k + 1) are both negative negaFibonacci-Niven numbers (A331088). A331092

G.f. A(x) satisfies A(x) = 1 - x/A(x)² * (1 - A(x) - A(x)³). A371889

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 459", based on the 5-celled von Neumann neighborhood. A272289

Numbers k that divide the k-th Apéry number (A005258). A372943

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 0, -1), (-1, 1, 1), (1, 0, 0)}. A148069