Properties of the Number -19181

Nineteen Thousand One Hundred Eighty-One

Basics

Value: -19182 → -19181 → -19180

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 19181

Divisors: 1, 19181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101011101101

Octal: -45355

Duodecimal: -B125

Hexadecimal: -4aed

Square: 367910761

Square Root: 138.49548729110273

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

G.f.: 1 / (1 + x + ∑_k>=2 prime(k-1) * x^k). A346792

Number of set-systems on n vertices where every covered vertex is the unique common element of some subset of the edges. A326965

Primes of the form p² - p - 1, where p is prime. A91568

Home primes whose homeliness is greater than 3. A133961

Home primes whose homeliness is 4. A133962

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

Row 4 of table A162430. A162433

a(n) = (prime(1+n)*prime(n)) + prime(n) + 1. A286624

a(1) = 37. For n > 1, a(n) = smallest prime q such that q^a(n-1-1) == 1 (mod a(n-1)²). A355600

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) = ∑_j=0..n binomial(n,j) * binomial(k·n+j,j). A387934