This number is a prime.

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+ California was the 31st state to be granted statehood. Hence, the U. S. flag was changed to display 31 stars and 13 stripes (an emirp pair). [Green]

+ On Landon Curt Noll's web page, "The English Name of a Number," he states that: With the following 31 words, we (are) able to count up to 999999999: zero one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty thirty forty fifty sixty seventy eighty ninety hundred thousand million. [Green]

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