1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers.

One (1) is the first natural number, followed by two. The Roman numeral for one is I. In mathematics, the number one is the multiplicative identity. [1] . It is also the only number for which these special facts are true: Any number multiplied by one equals that number: . For example, . Any number divided by one equals that number: . For example, .

1 （一 ／ 壹）是 0 與 2 之間的 自然數，是最小的正 奇數。 1是最小的 正整數。 在 數論 中，1是最小的 自然數。 1是唯一一個既不是 質數 也不是 合數 的自然數 [1]。 第1個 虧數， 真因數和 為0，虧度為1。 下一個為 2。 第1個 歐爾調和數，因數 調和平均數 為1。 下一個為 6。 第1個 高合成數。 下一個為 2。 第1個 無平方數因數的數。 下一個為 2。 第一個 超級冪數，有由多於一種方式構成的 次方數。 下一個為16。 （OEIS 數列 A117453） 第1個 平方數，為1的平方。 下一 …

1 (one) is a number, numeral, and the glyph that represents the number. It represents a single entity and is commonly regarded as the fundamental unit of counting and measurement. For example, a line segment of "unit length" is a line segment of length 1. In mathematics, the number 1 is the natural number that follows 0 and precedes 2.

The number 1 symbolized unity and the origin of all things, since all other numbers can be created from 1 by adding enough copies of it. For example, 7 = 1 + 1 + 1 + 1 + 1 + 1 + 1. The number…

Wikimedia Commons has media related to 1 (number). In mathematics, 1 is the number of things in a singleton, and it is the identity element for multiplication. This category is for concepts that are related to the number one. This category has the following 12 subcategories, out of 12 total.

2021年2月8日 · 这个意思其实也就是由“第一”转化而来的，表示很顶尖的。 She's still the world number one in tennis. 她仍然是世界头号网球选手。 I'm your number one fan. 我是你的超级崇拜者。 A: I have to go to the bathroom. B: Number 1 or number 2? 大的还是小的？ 为什么joey在哈哈大笑？ My elder brother is doing number two. 我哥哥在“上大号”。 特别声明：以上内容 (如有图片或视频亦包括在内)为自媒体平台“网易号”用户上传并发布，本平台仅提供信息存储服务。

1 is the Hindu-Arabic numeral for the number one (the unit). It is the smallest positive integer, and smallest natural number. 1 is the multiplicative identity, i.e. any number multiplied by 1 equals itself, for example: a ⋅ 1 = a {\displaystyle a \cdot 1=a} and 1 × a = a {\displaystyle 1\times...

2025年3月5日 · The number one (1), also called "unity," is the first positive integer. It is an odd number. Although the number 1 used to be considered a prime number, it requires special treatment in so many definitions and applications involving primes greater than or equal to 2 that it is usually placed into a class of its own (Wells 1986, p. 31).

Your guide to the number 1, an odd number which is uniquely neither prime nor composite. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun.