Properties of the Number -1289

Two Hundred Eighty-Nine

Basics

Value: -1290 → -1289 → -1288

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 1289

Divisors: 1, 1289

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10100001001

Octal: -2411

Duodecimal: -8B5

Hexadecimal: -509

Square: 1661521

Square Root: 35.90264614203248

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

a(n) = -n² + 9·n + 23. A126719

Triangular matrix, read by rows, equal to the matrix square of A102225, such that the first differences of row k forms row (k+1) of A102225. A102228

G.f.: (1 - x/(1 - x²/(1 - x³/(1 - x⁴/(1 - ...))))) * (1 + x/(1 + x²/(1 + x³/(1 + x⁴/(1 + ...))))), a continued fraction. A285638

a(n) = a(n-1)² - n^n-2 + n. A193925

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 217", based on the 5-celled von Neumann neighborhood. A270912

Lesser of twin primes. A1359

Sophie Germain primes p: 2p+1 is also prime. A5384

Primes of the form 2x² + 2xy + 17y². A139827

Square array of Delannoy numbers D(i,j) (i >= 0, j >= 0) read by antidiagonals. A8288

Primes of form 8n+1, that is, primes congruent to 1 mod 8. A7519