Properties of the Number 18919

Eighteen Thousand Nine Hundred Nineteen

Basics

Value: 18918 → 18919 → 18920

Parity: odd

Prime: Yes

Previous Prime: 18917

Next Prime: 18947

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 18919

Divisors: 1, 18919

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111100111

Octal: 44747

Duodecimal: AB47

Hexadecimal: 49e7

Square: 357928561

Square Root: 137.54635582231904

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 p(9n) is prime, where p(n) is the number of partitions of n. A114169

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

Last term of prime quadruples. A90258

Primes p such that q-p = 28, where q is the next prime after p. A124595

Least integer k such that k/2ⁿ > sqrt(1/3). A293328

Primes of the form m*(m+1)/2 + 4. A159048

Primes p such that p-2 and q are primes, where q is concatenation of binary representations of p and p-2: q = p·2^L + p-2, where L is the length of binary representation of p-2: L=A070939(p-2). A232237

Primes p such that p² = π(x³) + π(y³) for some positive integers·and y, where π(m) denotes the number of primes not exceeding m. A262730

Primes of the form 11·n² + 55·n + 43. A292578

The integer k that minimizes |k/2ⁿ - sqrt(1/3)|. A293329