Properties of the Number -1291

Two Hundred Ninety-One

Basics

Value: -1292 → -1291 → -1290

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 1291

Divisors: 1, 1291

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10100001011

Octal: -2413

Duodecimal: -8B7

Hexadecimal: -50b

Square: 1666681

Square Root: 35.93048844644336

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

Numerators of s(i) = s(i-1) - (1/i)*sign(s(i-1)) with s(1) = 1. A203810

a(n) = ∑_k=0..n A105595(k)*(-1)^k*A105595(n-k) (interpolated zeros suppressed). A105596

The c coefficients of the transform a·x² + (4·a/k - b)*x + 4·a/k² + 2·b/k + c = 0 for a,b,c = 1,-1,-1, k = 1,2,3... A229526

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 369", based on the 5-celled von Neumann neighborhood. A270793

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 429", based on the 5-celled von Neumann neighborhood. A272114

sin(sin(arcsinh(x))) = x-3/3!*x³+41/5!*x⁵-1291/7!*x⁷+73169/9!*x⁹... A12035

Greater of twin primes. A6512

Primes having only {1, 2, 9} as digits. A385776

Primes of the form 10·n+1. A30430

Primes that become a different prime under the mapping 0 <=> 2. A180517