Live analysis

9,999

9,999 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.).

9,999 (nine thousand nine hundred ninety-nine) is an odd 4-digit number. It is a composite number with 12 divisors, and factors as 3² × 11 × 101. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in hexadecimal, 0x270F.

Arithmetic Number Cube-Free Deficient Number Evil Number Flippable Gapful Number Kaprekar Number Palindrome Recamán's Sequence Repdigit

Interestingness

★ ★ ★ ★ ★

8 notable facts · grade A

9,987 9,988 9,989 9,990 9,991 9,992 9,993 9,994 9,995 9,996 9,997 9,998 9,999 10,000 10,001 10,002 10,003 10,004 10,005 10,006 10,007 10,008 10,009 10,010 10,011

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 36
Digit product: 6,561
Digital root: 9
Palindrome: Yes
Bit width: 14 bits
Flips to (rotate 180°): 6,666
Recamán's sequence: a(7,217) = 9,999
Square (n²): 99,980,001
Cube (n³): 999,700,029,999
Divisor count: 12
σ(n) — sum of divisors: 15,912
φ(n) — Euler's totient: 6,000
Sum of prime factors: 118

Primality

Prime factorization: 3 ² × 11 × 101

Nearest primes: 9,973 (−26) · 10,007 (+8)

Divisors & multiples

All divisors (12)

1 · 3 · 9 · 11 · 33 · 99 · 101 · 303 · 909 · 1111 · 3333 · 9999

Aliquot sum (sum of proper divisors): 5,913

Factor pairs (a × b = 9,999)

1 × 9999

3 × 3333

9 × 1111

11 × 909

33 × 303

99 × 101

First multiples

9,999 · 19,998 (double) · 29,997 · 39,996 · 49,995 · 59,994 · 69,993 · 79,992 · 89,991 · 99,990

Sums & aliquot sequence

As consecutive integers: 4,999 + 5,000 3,332 + 3,333 + 3,334 1,664 + 1,665 + 1,666 + 1,667 + 1,668 + 1,669 1,107 + 1,108 + … + 1,115

Aliquot sequence: 9,999 → 5,913 → 3,041 → 1 → 0 — terminates at zero

Continued fraction of √n

√9,999 = [99; (1, 198)]

Period length 2 — the block in parentheses repeats forever.

Representations

In words: nine thousand nine hundred ninety-nine
Ordinal: 9999th
Binary: 10011100001111
Octal: 23417
Hexadecimal: 0x270F
Base64: Jw8=
One's complement: 55,536 (16-bit)
Scientific notation: 9.999 × 10³
As a duration: 9,999 s = 2 hours, 46 minutes, 39 seconds

In other bases

ternary (3) 111201100

quaternary (4) 2130033

quinary (5) 304444

senary (6) 114143

septenary (7) 41103

nonary (9) 14640

undecimal (11) 7570

duodecimal (12) 5953

tridecimal (13) 4722

tetradecimal (14) 3903

pentadecimal (15) 2e69

As an angle

9,999° = 27 × 360° + 279°

279° ≈ 4.869 rad

Compass bearing: W (west)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵θϡϟθʹ
Mayan (base 20): 𝋡·𝋤·𝋳·𝋳
Chinese: 九千九百九十九
Chinese (financial): 玖仟玖佰玖拾玖

In other modern scripts

Eastern Arabic ٩٩٩٩ Devanagari ९९९९ Bengali ৯৯৯৯ Tamil ௯௯௯௯ Thai ๙๙๙๙ Tibetan ༩༩༩༩ Khmer ៩៩៩៩ Lao ໙໙໙໙ Burmese ၉၉၉၉

Digit at this position in famous constants

π — Pi (π): Digit 9,999 = 6
e — Euler's number (e): Digit 9,999 = 7
φ — Golden ratio (φ): Digit 9,999 = 8
√2 — Pythagoras's (√2): Digit 9,999 = 3
ln 2 — Natural log of 2: Digit 9,999 = 5
γ — Euler-Mascheroni (γ): Digit 9,999 = 1

Also seen as

Unicode codepoint

✏

Pencil

U+270F

Other symbol (So)

UTF-8 encoding: E2 9C 8F (3 bytes).

Lookup U+270F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00270F

RGB(0, 39, 15)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.39.15.

Address: 0.0.39.15
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.39.15

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

Musical pitch

Heard as a frequency, 9,999 Hz is closest to:

Concert pitch (A4 = 440 Hz): D♯9 (9956.1 Hz, +7¢)
Scientific pitch (C4 = 256 Hz): D♯9 (9742 Hz, +45¢ — about midway to E9)
Baroque pitch (A4 = 415 Hz): E9 (9948.8 Hz, +9¢)

Position in π

The digit sequence 9999 first appears in π at position 762 of the decimal expansion (the 762ordinal-suffix:nd 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 9999 on Pi Search ↗