Search This Site (Thousands of pages including some unique knowledge)
The Number 81: Properties and Meanings
Prime Factors of
81=
3x
3x
3x
3.
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(
9x
9).
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.