Properties of the Number 19564

Nineteen Thousand Five Hundred Sixty-Four

Basics

Value: 19563 → 19564 → 19565

Parity: even

Prime: No

Previous Prime: 19559

Next Prime: 19571

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 67 × 73

Divisors: 1, 2, 4, 67, 73, 134, 146, 268, 292, 4891

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110001101100

Octal: 46154

Duodecimal: B3A4

Hexadecimal: 4c6c

Square: 382750096

Square Root: 139.8713694792469

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

Numbers n such that n¹⁰²⁴ + 1 is prime (a generalized Fermat prime). A57002

Positions where A163890 obtains distinct new values. A163891

Number of primes of the form 12k + 1 less than 10ⁿ. A91161

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + 2·b(n-1) - b(n-2) - 1, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294564

Numbers k such that sopfr(k) = τ(k)². A305026

McKay-Thompson series of class 20D for Monster. A58553

Number of length n+5 0..3 arrays with some three disjoint pairs in each consecutive six terms having the same sum. A248484

G.f. A(x) satisfies: x = ∑_n>=1 xⁿ * (1+x)^n²/2 / A(x)^n/2. A325155

Number of line segments connecting exactly 10 points in an n·n grid of points. A177726

Partial sums of A004080. A194541