156
156 is the ISO 3166-1 numeric country code for China.
- Even
- Composite
Where 156 fits
Why 156 is special
The numeric codes are assigned in alphabetical order of the English country name at the time of allocation, which is why they are not sequential by region or size.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
- Prime factorisation
- 2^2 × 3 × 13
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 156
- Scientific notation
- 1.560 × 10^2
Roman numerals
C L V I
Binary
1 0 0 1 1 1 0 0
1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 156
Octal
2 3 4
2 × 64 + 3 × 8 + 4 × 1 = 156
Hexadecimal
9 c
9 × 16 + c × 1 = 156
Read as powers of two: 128 + 16 + 8 + 4 = 156.
In historical numeral systems
Egyptian
1 coil of rope, 5 hobbles, 6 strokes
1 × 100 + 5 × 10 + 6 × 1 = 156. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 vertical wedges (sixties place), 3 corner wedges + 6 vertical wedges (units place)
2 × 60 + 36 = 156. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
rho, then nu, then stigma, marked as a numeral
rho-nu-stigma + keraia
rho + nu + stigma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
qof, then nun, then vav
qof-nun-vav
qof (100) + nun (50) + vav (6) = 156, written in descending order.
Maya
1 bar + 2 dots (upper, twenties place) over 3 bars + 1 dot (lower, units place)
7 × 20 + 16 = 156. 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
China's ISO numeric code and its calling code. The two were assigned by different bodies decades apart, which is why neither is derivable from the other.
View 86 →Other connections
- is associated with86
why?
Strength 0.50, confidence "high".
Geography
156 is China's ISO numeric code. The codes were assigned alphabetically by English name when allocated, so the ordering preserves a snapshot of names rather than any geographic logic.
DocumentedGeographyGeography: China
Common questions
Is 156 a prime number?
No, 156 is not prime.
What are the factors of 156?
The factors of 156 are 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156.
What is 156 in Roman numerals?
156 in Roman numerals is CLVI.
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