Properties of the Number -6890

Eight Hundred Ninety

Basics

Value: -6891 → -6890 → -6889

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 13 × 53

Divisors: 1, 2, 5, 10, 13, 26, 53, 65, 106, 130

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1101011101010

Octal: -15352

Duodecimal: -3BA2

Hexadecimal: -1aea

Square: 47472100

Square Root: 83.00602387778854

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(1) = 1; a(n) = τ(n) - τ(n-1)* a(n-1) if n > 1. A79898

Numbers k such that (11·10^k + 19)/3 is prime. A270339

a(1) = 1 and a(n) = ceiling((∑_k=1..n-1 a(k))/3) for n >= 2. A72493

Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639). A242720

Numbers m that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 13 ways. A97102

Centered square numbers: a(n) = 4·n² + 4·n + 2. A69894

a(n) = prime(n)² + 1. A66872

Numbers having exactly three prime gaps in their factorization. A73495

T(n,k)=Number of length-n 0..k arrays with no repeated value differing from the previous repeated value by other than one. A269537

Expansion of ∏_k>=1 (1 - x^k)¹⁶. A739