361
A Go board has 361 intersections — 19 by 19.
Where 361 fits
Why 361 is special
Go's rules fit on a card and its game tree is vastly larger than chess's, which is why computers beat the world chess champion in 1997 and did not manage Go until 2016. The gap of nineteen years is entirely a consequence of that board size.
361 is part of
Factors & digit properties
- Divisors (3)
- 1, 19, 361
- Prime factorisation
- 19^2
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 361
- Scientific notation
- 3.610 × 10^2
Roman numerals
C C C L X I
Binary
1 0 1 1 0 1 0 0 1
1 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 361
Octal
5 5 1
5 × 64 + 5 × 8 + 1 × 1 = 361
Hexadecimal
1 6 9
1 × 256 + 6 × 16 + 9 × 1 = 361
Read as powers of two: 256 + 64 + 32 + 8 + 1 = 361.
In historical numeral systems
Egyptian
3 coils of rope, 6 hobbles, 1 stroke
3 × 100 + 6 × 10 + 1 × 1 = 361. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
6 vertical wedges (sixties place), 1 vertical wedge (units place)
6 × 60 + 1 = 361. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
tau, then xi, then alpha, marked as a numeral
tau-xi-alpha + keraia
tau + xi + alpha written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
shin, then samekh, then alef
shin-samekh-alef
shin (300) + samekh (60) + alef (1) = 361, written in descending order.
Maya
3 bars + 3 dots (upper, twenties place) over 1 dot (lower, units place)
18 × 20 + 1 = 361. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Powerful number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
361 intersections on a Go board against 64 squares on a chessboard. The difference in game-tree size is why computers mastered chess in 1997 and Go only in 2016.
View 64 →Other connections
- contrasts with64
why?
Strength 0.50, confidence "high".
Sport
A Go board has 361 intersections against a chessboard's 64 squares, and the resulting game tree is vastly larger. That gap is why a computer beat the world chess champion in 1997 and did not beat a top Go professional until 2016.
DocumentedSport
Common questions
Is 361 a prime number?
No, 361 is not prime.
What are the factors of 361?
The factors of 361 are 1, 19, 361.
What is 361 in Roman numerals?
361 in Roman numerals is CCCLXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026