Properties of the Number 22261

Twenty-Two Thousand Two Hundred Sixty-One

Basics

Value: 22260 → 22261 → 22262

Parity: odd

Prime: No

Previous Prime: 22259

Next Prime: 22271

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 113 × 197

Divisors: 1, 113, 197, 22261

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101011011110101

Octal: 53365

Duodecimal: 10A71

Hexadecimal: 56f5

Square: 495552121

Square Root: 149.20120642943877

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) = n⁴/2 - n³ + 3·n²/2 - n + 1 = (n² + 1)*(n² - 2·n + 2)/2. A58919

Downward vertical of triangular spiral in A051682. A81272

Indices of hexagonal numbers (A000384) which are also centered triangular numbers (A005448). A254283

a(n) = Product p_n·i^e_i if the prime factorization of n is Product p_i^e_i. A352028

Strong pseudoprimes to base 14. A20240

Strong pseudoprimes to base 83. A20309

a(n) = ∑_{k=0,1,2,...,n-4,n-2,n-1} a(k); a(n-3) is not a summand, with a(0)=0, a(1)=1, a(2)=3. A49859

Appearance radii of visible vectors in the medial axis test mask for the Euclidean distance in Z². A171988

Centered square numbers which are semiprime. A371016

(Prime(prime(n))²+1)/2. A92773