Properties of the Number 11685

Eleven Thousand Six Hundred Eighty-Five

Basics

Value: 11684 → 11685 → 11686

Parity: odd

Prime: No

Previous Prime: 11681

Next Prime: 11689

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 19 × 41

Divisors: 1, 3, 5, 15, 19, 41, 57, 95, 123, 205

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110110100101

Octal: 26645

Duodecimal: 6919

Hexadecimal: 2da5

Square: 136539225

Square Root: 108.09717850156868

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*(7·n-2). A135703

Odd interprimes divisible by 19. A126231

Fifth column (m=4) of (1,6)-Pascal triangle A096956. A96958

Odd squarefree numbers n such that the cyclotomic polynomial φ(n,x) has height 5. A152943

Numbers of the form m = p1·p2·p3·p4 where for each d∣m we have (d+m/d)/2 prime and p1 < p2 < p3 < p4 each prime. A128285

G.f.: ∑_k>=1 x^2·k/(1+x^2·k) * ∏_k>=1 1/(1-x^k). A305121

E.g.f. satisfies A(x) = 1 + x·A(x)*exp(x·A(x)³). A364981

Primitive elements of A119432. A119433

Products p·q*r·s of distinct primes for which (p·q*r·s + 1)/2 is prime. A234501

Numbers k such that 128·3^k - 1 is prime. A384228