Number

225

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

Deficient Number Evil Number Gapful Number Harshad / Niven Octagonal Perfect Square Powerful Number Recamán's Sequence Year

Historical context — 225 AD

Calendar year

Year 225 (CCXXV) was a common year starting on Saturday of the Julian calendar.

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Historical context — 225 BC

Calendar year

Year 225 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: Saturday
January 1, 225
Ended on: Saturday
December 31, 225
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 220s
220–229
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,801
1801 years before 2026.

In other calendars

Hebrew: 3985 / 3986 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 768 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 217 / 218 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 147 / 146 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 9
Digit product: 20
Digital root: 9
Palindrome: No
Bit width: 8 bits
Reversed: 522
Recamán's sequence: a(69) = 225
Square (n²): 50,625
Cube (n³): 11,390,625
Square root (√n): 15
Divisor count: 9
σ(n) — sum of divisors: 403
φ(n) — Euler's totient: 120
Sum of prime factors: 16

Primality

Prime factorization: 3 ² × 5 ²

Nearest primes: 223 (−2) · 227 (+2)

Divisors & multiples

All divisors (9)

1 · 3 · 5 · 9 · 15 · 25 · 45 · 75 · 225

Aliquot sum (sum of proper divisors): 178

Factor pairs (a × b = 225)

1 × 225

3 × 75

5 × 45

9 × 25

15 × 15

First multiples

225 · 450 (double) · 675 · 900 · 1,125 · 1,350 · 1,575 · 1,800 · 2,025 · 2,250

Sums & aliquot sequence

As a sum of two squares: 0² + 15² = 9² + 12²

As consecutive integers: 112 + 113 74 + 75 + 76 43 + 44 + 45 + 46 + 47 35 + 36 + 37 + 38 + 39 + 40

Aliquot sequence: 225 → 178 → 92 → 76 → 64 → 63 → 41 → 1 → 0 — terminates at zero

Representations

In words: two hundred twenty-five
Ordinal: 225th
Roman numeral: CCXXV
Binary: 11100001
Octal: 341
Hexadecimal: 0xE1
Base64: 4Q==
One's complement: 30 (8-bit)

In other bases

ternary (3) 22100

quaternary (4) 3201

quinary (5) 1400

senary (6) 1013

septenary (7) 441

nonary (9) 270

undecimal (11) 195

duodecimal (12) 169

tridecimal (13) 144

tetradecimal (14) 121

pentadecimal (15) 100

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): σκεʹ
Mayan (base 20): 𝋫·𝋥
Chinese: 二百二十五
Chinese (financial): 貳佰貳拾伍

In other modern scripts

Eastern Arabic ٢٢٥ Devanagari २२५ Bengali ২২৫ Tamil ௨௨௫ Thai ๒๒๕ Tibetan ༢༢༥ Khmer ២២៥ Lao ໒໒໕ Burmese ၂၂၅

Digit at this position in famous constants

π — Pi (π): Digit 225 = 7
e — Euler's number (e): Digit 225 = 4
φ — Golden ratio (φ): Digit 225 = 0
√2 — Pythagoras's (√2): Digit 225 = 9
ln 2 — Natural log of 2: Digit 225 = 7
γ — Euler-Mascheroni (γ): Digit 225 = 3

Also seen as

Unicode codepoint

Latin Small Letter A With Acute

U+00E1

Lowercase letter (Ll)

UTF-8 encoding: C3 A1 (2 bytes).

Lookup U+00E1 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000E1

RGB(0, 0, 225)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.225.

Address: 0.0.0.225
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.225

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

NANP area code 225

The number 225 is an active NANP area code (North American Numbering Plan).

Primary area: Baton Rouge
Region: Louisiana
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 225 ↗