Properties of the Number 19566

Nineteen Thousand Five Hundred Sixty-Six

Basics

Value: 19565 → 19566 → 19567

Parity: even

Prime: No

Previous Prime: 19559

Next Prime: 19571

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1087

Divisors: 1, 2, 3, 6, 9, 18, 1087, 2174, 3261, 6522

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110001101110

Octal: 46156

Duodecimal: B3A6

Hexadecimal: 4c6e

Square: 382828356

Square Root: 139.8785187224972

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

Number T(n,k) of colored compositions of n using all colors of a k-set such that all parts have different color patterns and the patterns for parts i are sorted and have i colors in (weakly) increasing order; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A327244

Number of ways to place 3 points on a triangular grid of side n so that no two of them are adjacent. A239569

Ulam's spiral (NNW spoke). A143860

33-gonal numbers: n(31n-29)/2. A98923

Number of partitions of n with exactly one prime number. A132381

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 585", based on the 5-celled von Neumann neighborhood. A273075

Expansion of 2*(1 - x)/(3 - theta₃(x)), where theta₃() is the Jacobi θ function. A303909

Knight's tour on spirally numbered infinite chessboard, when the knight always jumps on the unvisited square closest to the origin, first according to 1-norm, then 2-norm, then number of the square: a(n) = number of the square visited at the n-th move. A328908

Table read by antidiagonals: T(n,k) (n >= 3, k >= 0) is the number of cells in a regular n-gon after k generations of mitosis. A350000

The differences 1-1, 21-12, 321-123, ..., 10987654321-12345678910, 1110987654321-1234567891011, etc. A19566