<80 | Number Data-BaseRandom Number |
82> |

## The Number 81: Properties and Meanings

Prime Factors of**81**=3x3x3x3.

**81** can be Partitioned 41 times with each term no larger than 2.

**81** can be Partitioned 588 times with each term no larger than 3.

**81** is a Square Number(9x9).

**81** is a Heptagonal Number.

**81** is a 28-gonal Number.

**81** is a Centered Octagonal Number.

The **81** stable Chemical Elements.

The Chemical Element Thallium has an atomic number of **81**.

The **81** permutations of yin, yang and tao over 4 places.

Of the 117 scales of Chinese Dragons **81** are yang and benevolent.

### The Year 81 AD

In the year**81**AD The Arch of Titus was constructed.

In the year **81** AD Empress Deng Sui was born.

<80 | Number Data-BaseRandom Number |
82> |

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