Properties of the Number 19819

Nineteen Thousand Eight Hundred Nineteen

Basics

Value: 19818 → 19819 → 19820

Parity: odd

Prime: Yes

Previous Prime: 19813

Next Prime: 19841

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 19819

Divisors: 1, 19819

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101101011

Octal: 46553

Duodecimal: B577

Hexadecimal: 4d6b

Square: 392792761

Square Root: 140.77997016621364

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

Primes of the form 43·n² - 537·n + 2971 in order of increasing nonnegative values of n. A272285

Primes p such that q-p = 22, where q is the next prime after p. A61779

Primes having only {1, 8, 9} as digits. A385783

Primes of the form XYX, where Y is a single digit. A154270

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero. A316545

Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime. A255967

Four-column table read by rows: number of nonisomorphic systems of catafusenes in an example (see Cyvin et al. (1994) for precise definition). A121178

K-bit primes p such that p-2ⁱ and p+2ⁱ are composite for 0<=i<=K-1. A153352

Number of mono-4-polyhexes with n cells. A38392

Primes of the form abcabc..abcab. A228627