Live analysis

2,643

2,643 is a composite number, odd.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).

2,643 (two thousand six hundred forty-three) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 3 × 881. Written other ways, in Roman numerals it is MMDCXLIII and in binary, 101001010011.

Arithmetic Number Cube-Free Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree

Interestingness

★ ★ ★ ☆ ☆

5 notable facts · grade C

2,631 2,632 2,633 2,634 2,635 2,636 2,637 2,638 2,639 2,640 2,641 2,642 2,643 2,644 2,645 2,646 2,647 2,648 2,649 2,650 2,651 2,652 2,653 2,654 2,655

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 15
Digit product: 144
Digital root: 6
Palindrome: No
Bit width: 12 bits
Reversed: 3,462
Recamán's sequence: a(7,346) = 2,643
Square (n²): 6,985,449
Cube (n³): 18,462,541,707
Divisor count: 4
σ(n) — sum of divisors: 3,528
φ(n) — Euler's totient: 1,760
Sum of prime factors: 884

Primality

Prime factorization: 3 × 881

Nearest primes: 2,633 (−10) · 2,647 (+4)

Divisors & multiples

All divisors (4)

1 · 3 · 881 · 2643

Aliquot sum (sum of proper divisors): 885

Factor pairs (a × b = 2,643)

1 × 2643

3 × 881

First multiples

2,643 · 5,286 (double) · 7,929 · 10,572 · 13,215 · 15,858 · 18,501 · 21,144 · 23,787 · 26,430

Sums & aliquot sequence

As consecutive integers: 1,321 + 1,322 880 + 881 + 882 438 + 439 + 440 + 441 + 442 + 443

Aliquot sequence: 2,643 → 885 → 555 → 357 → 219 → 77 → 19 → 1 → 0 — terminates at zero

Continued fraction of √n

√2,643 = [51; (2, 2, 3, 1, 1, 4, 9, 7, 1, 4, 51, 4, 1, 7, 9, 4, 1, 1, 3, 2, 2, 102)]

Period length 22 — the block in parentheses repeats forever.

Representations

In words: two thousand six hundred forty-three
Ordinal: 2643rd
Roman numeral: MMDCXLIII
Binary: 101001010011
Octal: 5123
Hexadecimal: 0xA53
Base64: ClM=
One's complement: 62,892 (16-bit)
Scientific notation: 2.643 × 10³
As a duration: 2,643 s = 44 minutes, 3 seconds

In other bases

ternary (3) 10121220

quaternary (4) 221103

quinary (5) 41033

senary (6) 20123

septenary (7) 10464

nonary (9) 3556

undecimal (11) 1a93

duodecimal (12) 1643

tridecimal (13) 1284

tetradecimal (14) d6b

pentadecimal (15) bb3

As an angle

2,643° = 7 × 360° + 123°

123° ≈ 2.147 rad

Compass bearing: ESE (east-southeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): ͵βχμγʹ
Mayan (base 20): 𝋦·𝋬·𝋣
Chinese: 二千六百四十三
Chinese (financial): 貳仟陸佰肆拾參

In other modern scripts

Eastern Arabic ٢٦٤٣ Devanagari २६४३ Bengali ২৬৪৩ Tamil ௨௬௪௩ Thai ๒๖๔๓ Tibetan ༢༦༤༣ Khmer ២៦៤៣ Lao ໒໖໔໓ Burmese ၂၆၄၃

Digit at this position in famous constants

π — Pi (π): Digit 2,643 = 8
e — Euler's number (e): Digit 2,643 = 6
φ — Golden ratio (φ): Digit 2,643 = 8
√2 — Pythagoras's (√2): Digit 2,643 = 3
ln 2 — Natural log of 2: Digit 2,643 = 5
γ — Euler-Mascheroni (γ): Digit 2,643 = 1

Also seen as

Hex color

#000A53

RGB(0, 10, 83)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.10.83.

Address: 0.0.10.83
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.10.83

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

Musical pitch

Heard as a frequency, 2,643 Hz is closest to:

Concert pitch (A4 = 440 Hz): E7 (2637 Hz, +4¢)
Scientific pitch (C4 = 256 Hz): E7 (2580.3 Hz, +42¢)
Baroque pitch (A4 = 415 Hz): F7 (2635.1 Hz, +5¢)

Position in π

The digit sequence 2643 first appears in π at position 21 of the decimal expansion (the 21ordinal-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 2643 on Pi Search ↗