Properties of the Number 11661

Eleven Thousand Six Hundred Sixty-One

Basics

Value: 11660 → 11661 → 11662

Parity: odd

Prime: No

Previous Prime: 11657

Next Prime: 11677

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 13 ² × 23

Divisors: 1, 3, 13, 23, 39, 69, 169, 299, 507, 897

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110110001101

Octal: 26615

Duodecimal: 68B9

Hexadecimal: 2d8d

Square: 135978921

Square Root: 107.98611021793498

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

q-factorial numbers 3!_q. A69778

Numbers using only digits 1 and 6. A284293

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+239)² = y². A204765

a(n) = ∑_k=1..n-1 lcm(k,n-k). A6580

Bisection (even part) of Chebyshev sequence with Diophantine property. A77251

p(p²-p+1) as p runs through the primes. A83558

Number of Pythagorean quadruples mod n; i.e., number of solutions to w² + x² + y² = z² mod n. A96018

Numbers k such that σ(k - 2) = σ(k + 2). A223091

Sequence A001033 gives the numbers n such that the sum of the squares of n consecutive odd numbers x² + (x+2)² + ... +(x+2n-2)² = k² for some integer k. For each n, this sequence gives the least value of x. A56131

a(n) = 9·n² - 3. A157872