Properties of the Number 16819

Sixteen Thousand Eight Hundred Nineteen

Basics

Value: 16818 → 16819 → 16820

Parity: odd

Prime: No

Previous Prime: 16811

Next Prime: 16823

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 11 ² × 139

Divisors: 1, 11, 121, 139, 1529, 16819

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100000110110011

Octal: 40663

Duodecimal: 9897

Hexadecimal: 41b3

Square: 282878761

Square Root: 129.68808734806757

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

Base-8 Armstrong or narcissistic numbers (written in base 10). A10354

Base 8 perfect digital invariants (written in base 10): numbers equal to the sum of the k-th powers of their base-8 digits, for some k. A162231

Irregular triangle read by rows: T(n,k) is the number of free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2). A379623

a(n) = 20·n² - 1. A158491

Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2·n new points on the other two sides: sequence gives number of regions in the resulting planar graph. A366486

Integer k associated with the conjectured record-breaking length A226670(n) of primitive Collatz-like 3x+k cycles. A226671

a(n) = 841·n - 1. A158402

Integer k associated with the conjectured record-breaking number A226673(n) of odd elements in a primitive Collatz-like 3x+k cycle. A226674

E.g.f.: exp(-x/(1 - x)) / (1 - 2·x). A331688

Numbers n such that σ(n) and d(n) are both harmonic (Ore) numbers. A71767