Properties of the Number -18731

Eighteen Thousand Seven Hundred Thirty-One

Basics

Value: -18732 → -18731 → -18730

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 18731

Divisors: 1, 18731

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100100100101011

Octal: -44453

Duodecimal: -AA0B

Hexadecimal: -492b

Square: 350850361

Square Root: 136.8612436009552

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

Number of chains in power set of n-set. A7047

Central prime p in the smallest (2n+1)-tuple of consecutive primes that are symmetric with respect to p. A55380

Balanced primes of order seven. A96699

Doubly balanced primes: primes which are averages of both their immediate and their second neighbors. A51795

Numbers k such that 5^k + 2 is a prime. A87885

Balanced primes (A090403) of index 3. A96707

Number of chains of binary reflexive matrices of order n. A330301

Number of chains of 2-element subsets of {0,1, 2, ..., n} that contain no consecutive integers. A330302

First noncomposite number reached when iterating the map x -> x', when starting from x = A351255(n). Here x' is the arithmetic derivative of x, A003415. A351259

Primes p == 3 (mod 4) such that the multiplicative order of 2+-i modulo p in Gaussian integers (A385165) is not divisible by 2 or 3. A385188