Properties of the Number -191

One Hundred Ninety-One

Basics

Value: -192 → -191 → -190

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: Yes

Factorization: 191

Divisors: 1, 191

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10111111

Octal: -277

Duodecimal: -13B

Hexadecimal: -bf

Square: 36481

Square Root: 13.820274961085254

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

Carlitz-Riordan q-Catalan numbers (recurrence version) for q=-6. A15102

Alternating sum σ(1)-σ(2)+σ(3)-σ(4)+...+((-1)ⁿ⁺¹)*σ(n). A68762

A(n,k) is the n-th Carlitz-Riordan q-Catalan number (recurrence version) for q = -k; square array A(n,k), n>=0, k>=0, read by antidiagonals. A290789

Expansion of 1/∑_k>=0 x^k². A317665

Numerators of coefficients for numerical integration. A2195

Expansion of e.g.f. log(1+x)/exp(tanh(x)). A9439

Determinant of the n X n matrix with (i,j)-entry equal to 1 or 0 according as 2*(i + j) - 1 is prime or not. A228616

Expansion of ∏_k>=1 (1 + x^k)^λ(k) where λ(k) is the Liouville function, A008836. A118207

Numerators of upper right triangle of a(i,j) = Integral_x=i..i+1 ∑_k=0..j A048994(j,k)*x^k. A140825

Triangle, read by rows of n*(n+1)/2 terms, where row n equals the coefficients in the series reversion of the function G(x,n)-1 such that: x = ∑_m>=1 1/G(x,n)^n·m * ∏_k=1..m (1 - 1/G(x,n)^k), for n>=1. A214670