Number

170

170 is a composite number, even, a calendar year.

Deficient Number Evil Number Gapful Number Recamán's Sequence Sphenic Number Squarefree Year

Historical context — 170 AD

Calendar year

Year 170 (CLXX) was a common year starting on Sunday of the Julian calendar.

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Historical context — 170 BC

Calendar year

Year 170 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: Monday
January 1, 170
Ended on: Monday
December 31, 170
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: 1,856
1856 years before 2026.

In other calendars

Hebrew: 3930 / 3931 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 713 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 162 / 163 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 92 / 91 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 8
Digit product: 0
Digital root: 8
Palindrome: No
Bit width: 8 bits
Reversed: 71
Recamán's sequence: a(327) = 170
Square (n²): 28,900
Cube (n³): 4,913,000
Divisor count: 8
σ(n) — sum of divisors: 324
φ(n) — Euler's totient: 64
Sum of prime factors: 24

Primality

Prime factorization: 2 × 5 × 17

Nearest primes: 167 (−3) · 173 (+3)

Divisors & multiples

All divisors (8)

1 · 2 · 5 · 10 · 17 · 34 · 85 (half) · 170

Aliquot sum (sum of proper divisors): 154

Factor pairs (a × b = 170)

1 × 170

2 × 85

5 × 34

10 × 17

First multiples

170 · 340 (double) · 510 · 680 · 850 · 1,020 · 1,190 · 1,360 · 1,530 · 1,700

Sums & aliquot sequence

As a sum of two squares: 1² + 13² = 7² + 11²

As consecutive integers: 41 + 42 + 43 + 44 32 + 33 + 34 + 35 + 36 2 + 3 + … + 18

Aliquot sequence: 170 → 154 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: one hundred seventy
Ordinal: 170th
Roman numeral: CLXX
Binary: 10101010
Octal: 252
Hexadecimal: 0xAA
Base64: qg==
One's complement: 85 (8-bit)

In other bases

ternary (3) 20022

quaternary (4) 2222

quinary (5) 1140

senary (6) 442

septenary (7) 332

nonary (9) 208

undecimal (11) 145

duodecimal (12) 122

tridecimal (13) 101

tetradecimal (14) c2

pentadecimal (15) b5

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): ροʹ
Mayan (base 20): 𝋨·𝋪
Chinese: 一百七十
Chinese (financial): 壹佰柒拾

In other modern scripts

Eastern Arabic ١٧٠ Devanagari १७० Bengali ১৭০ Tamil ௧௭௦ Thai ๑๗๐ Tibetan ༡༧༠ Khmer ១៧០ Lao ໑໗໐ Burmese ၁၇၀

Digit at this position in famous constants

π — Pi (π): Digit 170 = 9
e — Euler's number (e): Digit 170 = 9
φ — Golden ratio (φ): Digit 170 = 9
√2 — Pythagoras's (√2): Digit 170 = 5
ln 2 — Natural log of 2: Digit 170 = 3
γ — Euler-Mascheroni (γ): Digit 170 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 170, here are decompositions:

3 + 167 = 170
7 + 163 = 170
13 + 157 = 170
19 + 151 = 170
31 + 139 = 170
43 + 127 = 170
61 + 109 = 170
67 + 103 = 170

Showing the first eight; more decompositions exist.

Unicode codepoint

Feminine Ordinal Indicator

U+00AA

Other letter (Lo)

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

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

Hex color

#0000AA

RGB(0, 0, 170)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.170.

Address: 0.0.0.170
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.170

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