Properties of the Number 27861

Twenty-Seven Thousand Eight Hundred Sixty-One

Basics

Value: 27860 → 27861 → 27862

Parity: odd

Prime: No

Previous Prime: 27851

Next Prime: 27883

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 37 × 251

Divisors: 1, 3, 37, 111, 251, 753, 9287, 27861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110110011010101

Octal: 66325

Duodecimal: 14159

Hexadecimal: 6cd5

Square: 776235321

Square Root: 166.91614661260306

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

T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of the elements above it, modulo 4. A239340

Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it, modulo 4. A239334

Number of nX6 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it, modulo 4. A239338

Number of length 7+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third. A248440

Total volume of all rectangular prisms with dimensions p, q and (p + q)/2 such that p and q are squarefree, n = p + q and p <= q. A303222

Numbers k such that k² + (k+1)² is prime. A27861

T(n,k)=Number of length n+2 0..k arrays with every three consecutive terms having the sum of some two elements equal to twice the third. A248433

a(n) = smallest number m > 0 such that n followed by m 9's yields a prime, or -1 if no such m exists. A373201