Number

605

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

Arithmetic Number Deficient Number Evil Number Harshad / Niven Recamán's Sequence Year

Historical context — 605 AD

Calendar year

Year 605 (DCV) was a common year starting on Friday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Notable events — 605 BC

Undated Nebuchadnezzar II becomes king of Babylon; the Neo-Babylonian Empire is at its height.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

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, 605
Ended on: Tuesday
December 31, 605
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 600s
600–609
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,421
1421 years before 2026.

In other calendars

Hebrew: 4365 / 4366 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Ox
Sexagenary cycle position 2 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1148 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 597 / 598 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 527 / 526 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 506
Recamán's sequence: a(1,049) = 605
Square (n²): 366,025
Cube (n³): 221,445,125
Divisor count: 6
σ(n) — sum of divisors: 798
φ(n) — Euler's totient: 440
Sum of prime factors: 27

Primality

Prime factorization: 5 × 11 ²

Nearest primes: 601 (−4) · 607 (+2)

Divisors & multiples

All divisors (6)

1 · 5 · 11 · 55 · 121 · 605

Aliquot sum (sum of proper divisors): 193

Factor pairs (a × b = 605)

1 × 605

5 × 121

11 × 55

First multiples

605 · 1,210 (double) · 1,815 · 2,420 · 3,025 · 3,630 · 4,235 · 4,840 · 5,445 · 6,050

Sums & aliquot sequence

As a sum of two squares: 11² + 22²

As consecutive integers: 302 + 303 119 + 120 + 121 + 122 + 123 56 + 57 + … + 65 50 + 51 + … + 60

Aliquot sequence: 605 → 193 → 1 → 0 — terminates at zero

Representations

In words: six hundred five
Ordinal: 605th
Roman numeral: DCV
Binary: 1001011101
Octal: 1135
Hexadecimal: 0x25D
Base64: Al0=
One's complement: 64,930 (16-bit)

In other bases

ternary (3) 211102

quaternary (4) 21131

quinary (5) 4410

senary (6) 2445

septenary (7) 1523

nonary (9) 742

undecimal (11) 500

duodecimal (12) 425

tridecimal (13) 377

tetradecimal (14) 313

pentadecimal (15) 2a5

Historical numeral systems

Babylonian (base 60): 𒌋 𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χεʹ
Mayan (base 20): 𝋡·𝋪·𝋥
Chinese: 六百零五
Chinese (financial): 陸佰零伍

In other modern scripts

Eastern Arabic ٦٠٥ Devanagari ६०५ Bengali ৬০৫ Tamil ௬௦௫ Thai ๖๐๕ Tibetan ༦༠༥ Khmer ៦០៥ Lao ໖໐໕ Burmese ၆၀၅

Digit at this position in famous constants

π — Pi (π): Digit 605 = 5
e — Euler's number (e): Digit 605 = 2
φ — Golden ratio (φ): Digit 605 = 0
√2 — Pythagoras's (√2): Digit 605 = 8
ln 2 — Natural log of 2: Digit 605 = 8
γ — Euler-Mascheroni (γ): Digit 605 = 9

Also seen as

Unicode codepoint

Latin Small Letter Reversed Open E With Hook

U+025D

Lowercase letter (Ll)

UTF-8 encoding: C9 9D (2 bytes).

Lookup U+025D on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00025D

RGB(0, 2, 93)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.93.

Address: 0.0.2.93
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.93

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

NANP area code 605

The number 605 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: South Dakota
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 605 ↗