Number

361

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

Arithmetic Number Deficient Number Odious Number Perfect Square Pernicious Number Powerful Number Recamán's Sequence Semiprime Year

Historical context — 361 AD

Calendar year

Year 361 (CCCLXI) was a common year starting on Monday of the Julian calendar.

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Historical context — 361 BC

Calendar year

Year 361 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: Sunday
January 1, 361
Ended on: Sunday
December 31, 361
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 360s
360–369
Century: 4th century
301–400
Millennium: 1st millennium
1–1000
Years ago: 1,665
1665 years before 2026.

In other calendars

Hebrew: 4121 / 4122 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Rooster
Sexagenary cycle position 58 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 904 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 353 / 354 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 283 / 282 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 10
Digit product: 18
Digital root: 1
Palindrome: No
Bit width: 9 bits
Reversed: 163
Recamán's sequence: a(9,078) = 361
Square (n²): 130,321
Cube (n³): 47,045,881
Square root (√n): 19
Divisor count: 3
σ(n) — sum of divisors: 381
φ(n) — Euler's totient: 342
Sum of prime factors: 38

Primality

Prime factorization: 19 ²

Nearest primes: 359 (−2) · 367 (+6)

Divisors & multiples

All divisors (3)

1 · 19 · 361

Aliquot sum (sum of proper divisors): 20

Factor pairs (a × b = 361)

1 × 361

19 × 19

First multiples

361 · 722 (double) · 1,083 · 1,444 · 1,805 · 2,166 · 2,527 · 2,888 · 3,249 · 3,610

Sums & aliquot sequence

As a sum of two squares: 0² + 19²

As consecutive integers: 180 + 181 10 + 11 + … + 28

Aliquot sequence: 361 → 20 → 22 → 14 → 10 → 8 → 7 → 1 → 0 — terminates at zero

Representations

In words: three hundred sixty-one
Ordinal: 361st
Roman numeral: CCCLXI
Binary: 101101001
Octal: 551
Hexadecimal: 0x169
Base64: AWk=
One's complement: 65,174 (16-bit)

In other bases

ternary (3) 111101

quaternary (4) 11221

quinary (5) 2421

senary (6) 1401

septenary (7) 1024

nonary (9) 441

undecimal (11) 2a9

duodecimal (12) 261

tridecimal (13) 21a

tetradecimal (14) 1bb

pentadecimal (15) 191

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹 𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): τξαʹ
Mayan (base 20): 𝋲·𝋡
Chinese: 三百六十一
Chinese (financial): 參佰陸拾壹

In other modern scripts

Eastern Arabic ٣٦١ Devanagari ३६१ Bengali ৩৬১ Tamil ௩௬௧ Thai ๓๖๑ Tibetan ༣༦༡ Khmer ៣៦១ Lao ໓໖໑ Burmese ၃၆၁

Digit at this position in famous constants

π — Pi (π): Digit 361 = 0
e — Euler's number (e): Digit 361 = 0
φ — Golden ratio (φ): Digit 361 = 6
√2 — Pythagoras's (√2): Digit 361 = 9
ln 2 — Natural log of 2: Digit 361 = 1
γ — Euler-Mascheroni (γ): Digit 361 = 4

Also seen as

Unicode codepoint

Latin Small Letter U With Tilde

U+0169

Lowercase letter (Ll)

UTF-8 encoding: C5 A9 (2 bytes).

Lookup U+0169 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000169

RGB(0, 1, 105)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.105.

Address: 0.0.1.105
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.105

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

NANP area code 361

The number 361 is an active NANP area code (North American Numbering Plan).

Primary area: Corpus Christi
Region: Texas
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 361 ↗