1089 (number)

← 1088 1089 1090 →
Cardinalone thousand eighty-nine
Ordinal1089th
(one thousand eighty-ninth)
Factorization32 × 112
Divisors1, 3, 9, 11, 33, 99, 121, 363, 1089
Greek numeral,ΑΠΘ´
Roman numeralMLXXXIX
Binary100010000012
Ternary11111003
Senary50136
Octal21018
Duodecimal76912
Hexadecimal44116

1089 is the integer after 1088 and before 1090. It is a square number (33 squared), a nonagonal number,[1] a 32-gonal number, a 364-gonal number, and a centered octagonal number.[2] 1089 is the first reverse-divisible number. The next is 2178 (= 1089 × 2 = 8712/4), and they are the only four-digit numbers that divide their reverse.

  1. ^ "Sloane's A001106 : 9-gonal (or enneagonal or nonagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.
  2. ^ "Sloane's A016754 : Odd squares: a(n) = (2n+1)^2. Also centered octagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.