Properties of the number 81

Symbolism

According to R. Allendy, "it is the individual effort, 1, in the nirvana world, 80, realizing the act of pure love, the solidarity by excellence - square of 9. It is to near 18, its reverse, even, which is like the static aspect of the same idea".
In China, this number is considered as perfect: "nine cooking of nine days give the pill of immortality of the taoches".
Considered by some authors as a mystical number of the moon.

General

In some messages given by Our Lord to a soul of Quebec, Jesus incited him to propagate the Neuvaine of Irradiating Hearts, that is to say of Hearts of Jesus and Mary, and this so as to reduce the time of the purification prophesied for our generation. This Neuvaine, Jesus wanted even that it is made 9 times in succession: "I promise graces of reconciliations for all those which participate to this Neuvaine 9 times in a row, that is to say during 81 days." This Neuvaine of 81 days is specially devoted to the reconciliation of the separated couples, so that "the disunited families will see themselves again in a perfect agreement...", without counting the graces of all kinds such as the conversion.
The "Tao-te king" is composed of 81 chapters.
Number of skies according to the Taoism.
The 81 "bardic" Triads summarizing the traditional teaching of Druids in a memotechnic way.
Darry signals that the number of angels that Jacob saw in dream to climb and descend a scale which connected the sky and the earth was 81.
In Jewish annals are found recorded 81 names of great Jewish priests, whose first was Aaron and the last Phannias or Phanasus.
It is at the age of 81 years old that Buddha and the Greek philosopher Plato died.
The existence of the man who was reached this age in China is considered as completed. To prolong it, all the balls of a Chinese abacus are torn and they throw them by the window, so that the official to the registers of the living and the dead, not having more any means of accounting, lets the old man to live beyond the term fixed for his death.
The magic square using the first 81 numbers is associated to the Moon and has for sum 369.

                         37 78 29 70 21 62 13 54  5
                          6 38 79 30 71 22 63 14 46
                         47  7 39 80 31 72 23 55 15
                         16 48  8 40 81 32 64 24 56
                         57 17 49  9 41 73 33 65 25
                         26 58 18 50  1 42 74 34 66
                         67 27 59 10 51  2 43 75 35
                         36 68 19 60 11 52  3 44 76
                         77 28 69 20 61 12 53  4 45