Properties of the Number 16215

Sixteen Thousand Two Hundred Fifteen

Basics

Value: 16214 → 16215 → 16216

Parity: odd

Prime: No

Previous Prime: 16193

Next Prime: 16217

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 23 × 47

Divisors: 1, 3, 5, 15, 23, 47, 69, 115, 141, 235

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: 11111101010111

Octal: 37527

Duodecimal: 9473

Hexadecimal: 3f57

Square: 262926225

Square Root: 127.33813254481157

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) = 1² + 3² + 5² + 7² + ... + (2·n-1)² = n*(4·n² - 1)/3. A447

Odd tetrahedral numbers: a(n) = (4·n+1)*(4·n+2)*(4·n+3)/6. A15219

a(n) = 4·binomial(11·n+4,n)/(11·n+4). A234870

Triangle, read by rows, where T(n,k) = C( C(n+2,3) - C(k+2,3) + 1, n-k) for n>=k>=0. A126450

The number of inequivalent ways to color the vertices of a regular octahedron using at most n colors. A198833

a(n) = lcm(n, n+1, n+2)/6. A67046

Odd composite numbers k such that cototient(k) - φ(k) = k - 2*φ(k) is an odd prime. A83255

a(n) = binomial(prime(n+2), 3). A126995

Expansion of ∑_k>0 x^3·k/(1-x^k)⁴. A363607

a(n) = binomial(3·n+2,3). A228888