Properties of the Number 6989

Six Thousand Nine Hundred Eighty-Nine

Basics

Value: 6988 → 6989 → 6990

Parity: odd

Prime: No

Previous Prime: 6983

Next Prime: 6991

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 29 × 241

Divisors: 1, 29, 241, 6989

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101101001101

Octal: 15515

Duodecimal: 4065

Hexadecimal: 1b4d

Square: 48846121

Square Root: 83.60023923410746

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

Sum of digits = 8 times number of digits. A61425

a(n) = 25·n² - 14·n + 2. A154357

Sum of values of vertices at level n of the hyperbolic Pascal pyramid PP_4,5. A293070

Numerator of ∑_k=1..n (-1)^k+1/prime(k)². A136368

Numbers k such that 19·2^k - 1 is prime. A1775

Numbers n such that the digits of σ(n) are exactly the same (albeit in different order) as the digits of φ(n), in base 10. A175795

Semiprimes with strictly increasing product of digits. A246569

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 611", based on the 5-celled von Neumann neighborhood. A273212

Chebyshev pseudoprimes to base 2: composite numbers k such that T(k, 2) == 2 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind. A330206

Composite integers m such that A003500(m) == 4 (mod m). A335673