Properties of the Number 19910

Nineteen Thousand Nine Hundred Ten

Basics

Value: 19909 → 19910 → 19911

Parity: even

Prime: No

Previous Prime: 19891

Next Prime: 19913

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 × 11 × 181

Divisors: 1, 2, 5, 10, 11, 22, 55, 110, 181, 362

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111000110

Octal: 46706

Duodecimal: B632

Hexadecimal: 4dc6

Square: 396408100

Square Root: 141.10279940525632

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 (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4. A252088

G.f.: ∑_k>=0 2^k * x^k² / ∏_j=1..k (1 - x^j). A376948

Monotonic ordering of set S generated by these rules: if·and y are in S then 3xy-x-y is in S, and 2 is in S. A192529

Number of sequences of rooted identity trees with a total of n nodes. A52806

a(1)=1, a(n)=a(n-1)+n³ if n odd, a(n)=a(n-1)+ n⁰ if n is even. A140152

Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4. A252082

Number of (n+2)X(6+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4. A252086

Records in A171797 starting from a(1). A305396

Numbers k such that 263·2^k-1 is prime. A50890

Number of ways to partition the set of vertices of a convex n-gon into non-intersecting directed polygons. A350599