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SpoilerThirteen.png End of my tether, don't say that word!
Areas of this article contain spoilers about Thirty-One. Please proceed with caution.

Read at your own risk.

Thirty-One, or 31, is a Numberblock made up of 31 blocks.


Not much is known about him, other than the fact that he loves calendars.


Thirty-One has red eyebrows, red eyes, a red mouth, and red limbs. Something special is that he has calendar hooks to make him look like a calendar.

Episode Appearances



Thirty-One's main arrangement his calendar arrangement, and it is his only (figured-out) arrangement seen in the show.

2D (21/74,541,651,404,935,148)

Figured-Out (5)
Compound Only (14)
Pattern Wall (2)


  • He is the first male Numberblock whose Numberling ends with a 1. The second is Eighty-One.
    • He is also the only male Numberblock figured-out onscreen with a compound counterpart made of females.
  • He is the second Numberblock to be male, but made from females, the first being Thirteen.
  • His calendar rings disappear when he's not in his calendar arrangement, as seen in the Numberblocks World app.
  • He is the first Numberblock in the 30s to be figured out.
    • He is also the first Numberblock in the 30s with the opposite gender of both his digits.
  • Thirty-One shares his face style with Twenty-Three and Twenty-Nine, because they are all male primes.
  • He has the least appearances out of all physical Numberblocks, with only one episode.