Number

1,649

1,649 is a composite number, odd, a calendar year.

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

Notable events — 1649 AD

Jan 30 King Charles I is beheaded outside the Banqueting House in London.
May 19 England is declared a Commonwealth.
Sep 11 Cromwell's troops massacre Catholic defenders at Drogheda.

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: Friday
January 1, 1649
Ended on: Friday
December 31, 1649
Friday the 13ths: 1
One Friday the 13th this year.
Easter Sunday: April 4
Sunday, April 4, 1649
Decade: 1640s
1640–1649
Century: 17th century
1601–1700
Millennium: 2nd millennium
1001–2000
Years ago: 377
377 years before 2026.

In other calendars

Hebrew: 5409 / 5410 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 1058 / 1059 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2192 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 1027 / 1028 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1641 / 1642 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1571 / 1570 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 20
Digit product: 216
Digital root: 2
Palindrome: No
Bit width: 11 bits
Reversed: 9,461
Recamán's sequence: a(758) = 1,649
Square (n²): 2,719,201
Cube (n³): 4,483,962,449
Divisor count: 4
σ(n) — sum of divisors: 1,764
φ(n) — Euler's totient: 1,536
Sum of prime factors: 114

Primality

Prime factorization: 17 × 97

Nearest primes: 1,637 (−12) · 1,657 (+8)

Divisors & multiples

All divisors (4)

1 · 17 · 97 · 1649

Aliquot sum (sum of proper divisors): 115

Factor pairs (a × b = 1,649)

1 × 1649

17 × 97

First multiples

1,649 · 3,298 (double) · 4,947 · 6,596 · 8,245 · 9,894 · 11,543 · 13,192 · 14,841 · 16,490

Sums & aliquot sequence

As a sum of two squares: 7² + 40² = 25² + 32²

As consecutive integers: 824 + 825 89 + 90 + … + 105 32 + 33 + … + 65

Aliquot sequence: 1,649 → 115 → 29 → 1 → 0 — terminates at zero

Representations

In words: one thousand six hundred forty-nine
Ordinal: 1649th
Roman numeral: MDCXLIX
Binary: 11001110001
Octal: 3161
Hexadecimal: 0x671
Base64: BnE=
One's complement: 63,886 (16-bit)

In other bases

ternary (3) 2021002

quaternary (4) 121301

quinary (5) 23044

senary (6) 11345

septenary (7) 4544

nonary (9) 2232

undecimal (11) 126a

duodecimal (12) b55

tridecimal (13) 99b

tetradecimal (14) 85b

pentadecimal (15) 74e

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αχμθʹ
Mayan (base 20): 𝋤·𝋢·𝋩
Chinese: 一千六百四十九
Chinese (financial): 壹仟陸佰肆拾玖

In other modern scripts

Eastern Arabic ١٦٤٩ Devanagari १६४९ Bengali ১৬৪৯ Tamil ௧௬௪௯ Thai ๑๖๔๙ Tibetan ༡༦༤༩ Khmer ១៦៤៩ Lao ໑໖໔໙ Burmese ၁၆၄၉

Digit at this position in famous constants

π — Pi (π): Digit 1,649 = 5
e — Euler's number (e): Digit 1,649 = 1
φ — Golden ratio (φ): Digit 1,649 = 2
√2 — Pythagoras's (√2): Digit 1,649 = 6
ln 2 — Natural log of 2: Digit 1,649 = 2
γ — Euler-Mascheroni (γ): Digit 1,649 = 6

Also seen as

Unicode codepoint

Arabic Letter Alef Wasla

U+0671

Other letter (Lo)

UTF-8 encoding: D9 B1 (2 bytes).

Lookup U+0671 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000671

RGB(0, 6, 113)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.113.

Address: 0.0.6.113
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.113

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

Position in π

The digit sequence 1649 first appears in π at position 11,681 of the decimal expansion (the 11,681ordinal-suffix:st digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1649 on Pi Search ↗