Properties of the Number -18811

Eighteen Thousand Eight Hundred Eleven

Basics

Value: -18812 → -18811 → -18810

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 13 × 1447

Divisors: 1, 13, 1447, 18811

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100101111011

Octal: -44573

Duodecimal: -AA77

Hexadecimal: -497b

Square: 353853721

Square Root: 137.15319901482428

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 consisting of ones and eights. A213084

a(n) = smallest number > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes. A51956

Semiprimes (A001358) whose digit reversal is a square. A115710

Number of (w,x,y) with all terms in {0,...,n} and w ≠ min(|w-x|, |x-y|). A213499

a(n) is the smallest positive integer k with k ≠ 10^m (m: nonnegative integer) for which 1/n can be obtained by incorrectly reducing k/(n·k) - by deleting the same digit in the numerator and denominator as often as possible, leaving one digit "1" in the numerator. A370911

Squares of 1 and primes, written backwards. A60998

Semiprimes whose digit reversal is a nontrivial power. A108849

Sp = reversal of some square s where s = x² for x = 1,2,.. (ignoring leading zeros). Sp is in the sequence if it is semiprime. A242097

Triangle of number of interval-closed sets T(m,n) in the product of two chains [m]x[n], for m <= n, read by rows. A367109