201
201 is the HTTP status code Created — the request succeeded and a new resource now exists.
- Odd
- Composite
Where 201 fits
Why 201 is special
201 is what a well-behaved API returns when a POST actually made something. The specification expects it to carry a Location header pointing at the new resource, which is the difference between 'we handled that' and 'here is what you made'. Returning a plain 200 instead loses the client its address.
Not just a mathematical number
201is also used in ways where ordinary arithmetic doesn't apply — each listed below with what genuinely does and doesn't follow from it.
- Mathematical number
A genuine quantity — its mathematical properties (prime, square, factors, and so on) are real facts about it.
A genuine quantity that ordinary arithmetic applies to — it can be prime, even, a perfect square, added to another number meaningfully, and so on.
- Code
Also used as a code — HTTP status codes.
An assigned identifier from a fixed registry or standard — its digits don't represent an amount, and arithmetic on it is meaningless (HTTP status 404 + 1 is not a 'better' status; it's a different, unrelated code).
Factors & digit properties
- Divisors (4)
- 1, 3, 67, 201
- Prime factorisation
- 3 × 67
- Digit sum
- 3
- Digital root
- 3
Representations
- Decimal
- 201
- Scientific notation
- 2.010 × 10^2
Roman numerals
C C I
Binary
1 1 0 0 1 0 0 1
1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 201
Octal
3 1 1
3 × 64 + 1 × 8 + 1 × 1 = 201
Hexadecimal
c 9
c × 16 + 9 × 1 = 201
Read as powers of two: 128 + 64 + 8 + 1 = 201.
In historical numeral systems
Egyptian
2 coils of rope, 1 stroke
2 × 100 + 1 × 1 = 201. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 vertical wedges (sixties place), 2 corner wedges + 1 vertical wedge (units place)
3 × 60 + 21 = 201. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then alpha, marked as a numeral
sigma-alpha + keraia
sigma + alpha written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then alef
resh-alef
resh (200) + alef (1) = 201, written in descending order.
Maya
2 bars (upper, twenties place) over 1 dot (lower, units place)
10 × 20 + 1 = 201. 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
- Semiprime
- Harshad (Niven) number
- Lucky number (mathematical sieve)
Related numbers & connections
201 is issued when a request created a new resource, and is expected to name that resource in a Location header.
201 says the thing was created; 202 says the request was accepted and may yet fail. Treating them alike is how queued work appears to succeed and quietly does not.
View 202 →Numbers Around Us
- appears inHTTP status codes
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with202
why?
Strength 0.50, confidence "high".
Technology & computing
A 201 is expected to carry a Location header naming the resource it just made. That is the difference between an API that confirms and one that is useful: the client gets an address rather than having to guess or re-query. Returning 200 for a creation is common and loses that.
DocumentedTechnology & computing
Common questions
Is 201 a prime number?
No, 201 is not prime.
What are the factors of 201?
The factors of 201 are 1, 3, 67, 201.
What is 201 in Roman numerals?
201 in Roman numerals is CCI.
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