| ||||
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Cardinal | one hundred nine | |||
Ordinal | 109th (one hundred ninth) | |||
Factorization | prime | |||
Prime | 29th | |||
Divisors | 1, 109 | |||
Greek numeral | ΡΘ´ | |||
Roman numeral | CIX | |||
Binary | 11011012 | |||
Ternary | 110013 | |||
Senary | 3016 | |||
Octal | 1558 | |||
Duodecimal | 9112 | |||
Hexadecimal | 6D16 |
109 (one hundred [and] nine) is the natural number following 108 and preceding 110.
109 is the 29th prime number. As 29 is itself prime, 109 is a super-prime. [1] The previous prime is 107, making them both twin primes. [2] 109 is a centered triangular number. [3]
There are exactly 109 different families of subsets of a three-element set whose union includes all three elements, [4] 109 different loops (invertible but not necessarily associative binary operations with an identity) on six elements, [5] and 109 squares on an infinite chessboard that can be reached by a knight within three moves. [6]
The decimal expansion of 1/109 has 108 digits, making 109 a full reptend prime. The last six digits of the 108-digit cycle are 853211, the first six Fibonacci numbers in descending order. [7]
The decimal expansion of 1/109 can also be computed using the alternating series
19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number.
21 (twenty-one) is the natural number following 20 and preceding 22.
68 (sixty-eight) is the natural number following 67 and preceding 69. It is an even number.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.
2000 is a natural number following 1999 and preceding 2001.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
One million (1,000,000), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.
100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.
10,000,000 is the natural number following 9,999,999 and preceding 10,000,001.
100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.
204 is the natural number following 203 and preceding 205.
40,000 is the natural number that comes after 39,999 and before 40,001. It is the square of 200.
9000 is the natural number following 8999 and preceding 9001.