Number

173

173 is a prime, odd, a calendar year.

Arithmetic Number Balanced Prime Deficient Number Odious Number Pernicious Number Prime Pythagorean Prime Recamán's Sequence Sexy Prime Sophie Germain Prime Squarefree Year

Historical context — 173 AD

Calendar year

Year 173 (CLXXIII) was a common year starting on Thursday of the Julian calendar.

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Historical context — 173 BC

Calendar year

Year 173 BC was a year of the pre-Julian Roman calendar.

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Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Friday
January 1, 173
Ended on: Friday
December 31, 173
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 170s
170–179
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,853
1853 years before 2026.

In other calendars

Hebrew: 3933 / 3934 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Ox
Sexagenary cycle position 50 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 716 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 165 / 166 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 95 / 94 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 21
Digital root: 2
Palindrome: No
Bit width: 8 bits
Reversed: 371
Recamán's sequence: a(321) = 173
Square (n²): 29,929
Cube (n³): 5,177,717
Divisor count: 2
σ(n) — sum of divisors: 174
φ(n) — Euler's totient: 172

Primality

173 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 173

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 173)

1 × 173

First multiples

173 · 346 (double) · 519 · 692 · 865 · 1,038 · 1,211 · 1,384 · 1,557 · 1,730

Sums & aliquot sequence

As a sum of two squares: 2² + 13²

As consecutive integers: 86 + 87

Representations

In words: one hundred seventy-three
Ordinal: 173rd
Roman numeral: CLXXIII
Binary: 10101101
Octal: 255
Hexadecimal: 0xAD
Base64: rQ==
One's complement: 82 (8-bit)

In other bases

ternary (3) 20102

quaternary (4) 2231

quinary (5) 1143

senary (6) 445

septenary (7) 335

nonary (9) 212

undecimal (11) 148

duodecimal (12) 125

tridecimal (13) 104

tetradecimal (14) c5

pentadecimal (15) b8

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): ρογʹ
Mayan (base 20): 𝋨·𝋭
Chinese: 一百七十三
Chinese (financial): 壹佰柒拾參

In other modern scripts

Eastern Arabic ١٧٣ Devanagari १७३ Bengali ১৭৩ Tamil ௧௭௩ Thai ๑๗๓ Tibetan ༡༧༣ Khmer ១៧៣ Lao ໑໗໓ Burmese ၁၇၃

Digit at this position in famous constants

π — Pi (π): Digit 173 = 5
e — Euler's number (e): Digit 173 = 4
φ — Golden ratio (φ): Digit 173 = 5
√2 — Pythagoras's (√2): Digit 173 = 5
ln 2 — Natural log of 2: Digit 173 = 4
γ — Euler-Mascheroni (γ): Digit 173 = 3

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 167 (gap of 6)
Next prime: 179 (gap of 6)

Pair status: sexy with 167, sexy with 179.

Unicode codepoint

Soft Hyphen

U+00AD

Format character (Cf)

UTF-8 encoding: C2 AD (2 bytes).

Lookup U+00AD on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000AD

RGB(0, 0, 173)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.173.

Address: 0.0.0.173
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.173

Unspecified address (0.0.0.0/8) — "this network" placeholder.