Properties of the Number -2643

Six Hundred Forty-Three

Basics

Value: -2644 → -2643 → -2642

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 881

Divisors: 1, 3, 881, 2643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001010011

Octal: -5123

Duodecimal: -1643

Hexadecimal: -a53

Square: 6985449

Square Root: 51.41011573610781

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

Glaisher's function H'(4n+1) (18 squares version). A2610

Values of n such that L(7) and N(7) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A226927

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 49", based on the 5-celled von Neumann neighborhood. A270017

Expansion of g.f. (1-x)(x²-5x+3)/(x⁴-6x³+13x²-6x+1). A105660

Number of integer partitions of n into relatively prime parts that are all greater than 1. A302698

Number of integer partitions of n with integer reverse-alternating product. A347445

Numbers such that floor(a(n)² / 6) is a square. A204518

Number of odd-length integer partitions of n with integer alternating product. A347444

a(1) = 6; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime. A74342

Numbers k such that lcm(1,2,3,...,k)/5 equals the denominator of the k-th harmonic number H(k). A112814