Properties of the Number -6689

Six Hundred Eighty-Nine

Basics

Value: -6690 → -6689 → -6688

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 6689

Divisors: 1, 6689

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1101000100001

Octal: -15041

Duodecimal: -3A55

Hexadecimal: -1a21

Square: 44742721

Square Root: 81.78630692236935

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

Values of n such that L(17) and N(17) 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. A227520

Numbers that are the sum of 4 positive 7th powers. A3371

Primes from merging of 4 successive digits in decimal expansion of the Golden Ratio, (1+sqrt(5))/2. A103810

Primes of the form x²+101y². A139489

Start of a string of exactly 2 consecutive (but disjoint) pairs of twin primes. A35790

a(n) = prime(n*(n+1)/2 + 1). A78721

Primes having only {6, 8, 9} as digits. A385800

Mother primes of order 9. A136068

Primes of the form 2^a + 3^b. A4051

Primes whose digits are composite; primes having only {4, 6, 8, 9} as digits. A51416