162,173
162173 Ryugu was the target of Hayabusa2.
- Odd
- Composite
Where 162,173 fits
Why 162,173 is special
The mission fired a projectile to create an artificial crater and collected subsurface material that had not been altered by space weathering.
162,173 is part of
Factors & digit properties
- Divisors (8)
- 1, 11, 23, 253, 641, 7051, 14743, 162173
- Prime factorisation
- 11 × 23 × 641
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 162173
- Scientific notation
- 1.622 × 10^5
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 0 0 1 1 1 1 0 0 1 0 1 1 1 1 1 0 1
1 × 131,072 + 0 × 65,536 + 0 × 32,768 + 1 × 16,384 + 1 × 8,192 + 1 × 4,096 + 1 × 2,048 + 0 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 162,173
Octal
4 7 4 5 7 5
4 × 32,768 + 7 × 4,096 + 4 × 512 + 5 × 64 + 7 × 8 + 5 × 1 = 162,173
Hexadecimal
2 7 9 7 d
2 × 65,536 + 7 × 4,096 + 9 × 256 + 7 × 16 + d × 1 = 162,173
Read as powers of two: 131,072 + 16,384 + 8,192 + 4,096 + 2,048 + 256 + 64 + 32 + 16 + 8 + 4 + 1 = 162,173.
In historical numeral systems
Egyptian
1 tadpole, 6 fingers, 2 lotuses, 1 coil of rope, 7 hobbles, 3 strokes
1 × 100,000 + 6 × 10,000 + 2 × 1,000 + 1 × 100 + 7 × 10 + 3 × 1 = 162,173. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
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
- Happy number
Related numbers & connections
Both missions returned carbonaceous asteroid material within three years, and both found surfaces far weaker than expected.
View 101955 →Hayabusa2 corrected the sampling failures of the first mission and returned material from a crater it made deliberately.
View 25143 →Science
Hayabusa2 surveyed 162173 Ryugu from 2018, created an artificial impact crater and returned surface and subsurface samples to Earth in December 2020.
DocumentedSciencePeriod: 1999–
Common questions
Is 162,173 a prime number?
No, 162,173 is not prime.
What are the factors of 162,173?
The factors of 162,173 are 1, 11, 23, 253, 641, 7051, 14743, 162173.
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