Number

171

171 is a composite number, odd, a calendar year.

Deficient Number Harshad / Niven Odious Number Palindrome Pernicious Number Recamán's Sequence Triangular Year

Historical context — 171 AD

Calendar year

Year 171 (CLXXI) was a common year starting on Monday of the Julian calendar.

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Historical context — 171 BC

Calendar year

Year 171 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: Tuesday
January 1, 171
Ended on: Tuesday
December 31, 171
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 170s
170–179
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,855
1855 years before 2026.

In other calendars

Hebrew: 3931 / 3932 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Pig
Sexagenary cycle position 48 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 714 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 163 / 164 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 93 / 92 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 9
Digit product: 7
Digital root: 9
Palindrome: Yes
Bit width: 8 bits
Recamán's sequence: a(325) = 171
Square (n²): 29,241
Cube (n³): 5,000,211
Divisor count: 6
σ(n) — sum of divisors: 260
φ(n) — Euler's totient: 108
Sum of prime factors: 25

Primality

Prime factorization: 3 ² × 19

Nearest primes: 167 (−4) · 173 (+2)

Divisors & multiples

All divisors (6)

1 · 3 · 9 · 19 · 57 · 171

Aliquot sum (sum of proper divisors): 89

Factor pairs (a × b = 171)

1 × 171

3 × 57

9 × 19

First multiples

171 · 342 (double) · 513 · 684 · 855 · 1,026 · 1,197 · 1,368 · 1,539 · 1,710

Sums & aliquot sequence

As consecutive integers: 85 + 86 56 + 57 + 58 26 + 27 + 28 + 29 + 30 + 31 15 + 16 + … + 23

Aliquot sequence: 171 → 89 → 1 → 0 — terminates at zero

Representations

In words: one hundred seventy-one
Ordinal: 171st
Roman numeral: CLXXI
Binary: 10101011
Octal: 253
Hexadecimal: 0xAB
Base64: qw==
One's complement: 84 (8-bit)

In other bases

ternary (3) 20100

quaternary (4) 2223

quinary (5) 1141

senary (6) 443

septenary (7) 333

nonary (9) 210

undecimal (11) 146

duodecimal (12) 123

tridecimal (13) 102

tetradecimal (14) c3

pentadecimal (15) b6

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ροαʹ
Mayan (base 20): 𝋨·𝋫
Chinese: 一百七十一
Chinese (financial): 壹佰柒拾壹

In other modern scripts

Eastern Arabic ١٧١ Devanagari १७१ Bengali ১৭১ Tamil ௧௭௧ Thai ๑๗๑ Tibetan ༡༧༡ Khmer ១៧១ Lao ໑໗໑ Burmese ၁၇၁

Digit at this position in famous constants

π — Pi (π): Digit 171 = 3
e — Euler's number (e): Digit 171 = 4
φ — Golden ratio (φ): Digit 171 = 3
√2 — Pythagoras's (√2): Digit 171 = 0
ln 2 — Natural log of 2: Digit 171 = 7
γ — Euler-Mascheroni (γ): Digit 171 = 3

Also seen as

Unicode codepoint

Left-Pointing Double Angle Quotation Mark

U+00AB

Initial quote (Pi)

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

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

Hex color

#0000AB

RGB(0, 0, 171)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.171.

Address: 0.0.0.171
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.171

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