A page of the Numeropedia - the Special Encyclopedia of Numbers

30,000,000 – 31,000,000 – 32,000,000 – 33,000,000 – 34,000,000

35,000,000 – 36,000,000 – 37,000,000 – 38,000,000 – 39,000,000

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**31,536,000 **

[Calendar] The number of seconds in a calendar non-leap (365-day) year.

**31,536,855**

[Math.] A pair of amicable numbers (31536855, 32148585).

** **

**31,556,925 **

[Astronomy] Tropical year = 31,556,925.4752 seconds = 365 days 5 h 48 m 45.48 s. Sidereal year is the time interval that the Earth returns to the same place in its orbit relative to a fixed star, 31,558,149.504 seconds = 365 days 6 h 9 m 9.5 s. The sidereal year is longer than tropical year because of the slow westward shift of the equinoctial point along the plane of the elliptic at a rate of 50.27 seconds of arc per year. Anomalistic year is 365 days 6 h 13 m 33 s.

**31,557,600 **

[Calendar] The average number of seconds in a Julian calendar year.

** **

**31,558,149**

** **[Astronomy] Sidereal year is the time interval that the Earth returns to the same place in its orbit relative to a fixed star, 31,558,149.504 seconds = 365 days 6*h* 9*m* 9.5*s*. Tropical year = 31,556,925.4752 seconds = 365 days 5*h* 48*m* 45.48*s*. The sidereal year is longer than tropical year because of the slow westward shift of the equinoctial point along the plane of the elliptic at a rate of 50.27 seconds of arc per year. Anomalistic year is 365 days 6*h* 13*m* 33*s*.

**31,622,400 **

[Calendar] The number of seconds in a calendar leap (366-day) year.

** **

**31,652,704 **

[Math.] A pair of amicable numbers (30830696, 31652704).

**31,703,171**

[Math.] A prime number. So is 31,783,177.

** **

**31,818,952 **

[Math.] A pair of amicable numbers (31818952, 34860248).

**31,850,496**

[Math.] 31,850,496 = 1^{2}×2^{3}×3^{5}×4^{7}.

**31,850,496 **

[Math.] 31,850,496 = 4^{4}×6^{3}×8^{2}×9^{1}.

*xy*,*abc,def*

[Math.] For any *xy* = 10 to 99, there are always six 6-digit numbers *abc,edf *such that the sum (*xy*+*abc,def*) is equal to one of 6 digit-rotations of 142,857 and the number *xy,abc,def* is a multiple of 142,857.

For any *xy* = 10 to 99, there are always twelve 6-digit numbers *abc,edf *such that the sum (*xy*+*abc,def*) is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number *xy,abc,def* is a multiple of 76,923.