Number

649

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

Arithmetic Number Deficient Number Evil Number Happy Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 649 AD

Calendar year

Year 649 (DCXLIX) was a common year starting on Thursday of the Julian calendar.

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Historical context — 649 BC

Calendar year

The year 649 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, 649
Ended on: Monday
December 31, 649
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 640s
640–649
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,377
1377 years before 2026.

In other calendars

Hebrew: 4409 / 4410 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 28 / 29 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Rooster
Sexagenary cycle position 46 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1192 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 27 / 28 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 641 / 642 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 571 / 570 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 19
Digit product: 216
Digital root: 1
Palindrome: No
Bit width: 10 bits
Reversed: 946
Recamán's sequence: a(2,326) = 649
Square (n²): 421,201
Cube (n³): 273,359,449
Divisor count: 4
σ(n) — sum of divisors: 720
φ(n) — Euler's totient: 580
Sum of prime factors: 70

Primality

Prime factorization: 11 × 59

Nearest primes: 647 (−2) · 653 (+4)

Divisors & multiples

All divisors (4)

1 · 11 · 59 · 649

Aliquot sum (sum of proper divisors): 71

Factor pairs (a × b = 649)

1 × 649

11 × 59

First multiples

649 · 1,298 (double) · 1,947 · 2,596 · 3,245 · 3,894 · 4,543 · 5,192 · 5,841 · 6,490

Sums & aliquot sequence

As consecutive integers: 324 + 325 54 + 55 + … + 64 19 + 20 + … + 40

Aliquot sequence: 649 → 71 → 1 → 0 — terminates at zero

Representations

In words: six hundred forty-nine
Ordinal: 649th
Roman numeral: DCXLIX
Binary: 1010001001
Octal: 1211
Hexadecimal: 0x289
Base64: Aok=
One's complement: 64,886 (16-bit)

In other bases

ternary (3) 220001

quaternary (4) 22021

quinary (5) 10044

senary (6) 3001

septenary (7) 1615

nonary (9) 801

undecimal (11) 540

duodecimal (12) 461

tridecimal (13) 3ac

tetradecimal (14) 345

pentadecimal (15) 2d4

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χμθʹ
Mayan (base 20): 𝋡·𝋬·𝋩
Chinese: 六百四十九
Chinese (financial): 陸佰肆拾玖

In other modern scripts

Eastern Arabic ٦٤٩ Devanagari ६४९ Bengali ৬৪৯ Tamil ௬௪௯ Thai ๖๔๙ Tibetan ༦༤༩ Khmer ៦៤៩ Lao ໖໔໙ Burmese ၆၄၉

Digit at this position in famous constants

π — Pi (π): Digit 649 = 8
e — Euler's number (e): Digit 649 = 4
φ — Golden ratio (φ): Digit 649 = 1
√2 — Pythagoras's (√2): Digit 649 = 2
ln 2 — Natural log of 2: Digit 649 = 4
γ — Euler-Mascheroni (γ): Digit 649 = 9

Also seen as

Unicode codepoint

Latin Small Letter U Bar

U+0289

Lowercase letter (Ll)

UTF-8 encoding: CA 89 (2 bytes).

Lookup U+0289 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000289

RGB(0, 2, 137)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.137.

Address: 0.0.2.137
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.137

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

NANP area code 649

The number 649 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: Turks and Caicos Islands
Country: Turks and Caicos Islands

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 649 ↗