Live analysis

2,691

2,691 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.).

2,691 (two thousand six hundred ninety-one) is an odd 4-digit number. It is a composite number with 12 divisors, and factors as 3² × 13 × 23. Written other ways, in Roman numerals it is MMDCXCI and in binary, 101010000011.

Arithmetic Number Cube-Free Deficient Number Odious Number Pernicious Number Recamán's Sequence

Interestingness

★ ☆ ☆ ☆ ☆

3 notable facts · grade F

2,679 2,680 2,681 2,682 2,683 2,684 2,685 2,686 2,687 2,688 2,689 2,690 2,691 2,692 2,693 2,694 2,695 2,696 2,697 2,698 2,699 2,700 2,701 2,702 2,703

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 18
Digit product: 108
Digital root: 9
Palindrome: No
Bit width: 12 bits
Reversed: 1,962
Recamán's sequence: a(989) = 2,691
Square (n²): 7,241,481
Cube (n³): 19,486,825,371
Divisor count: 12
σ(n) — sum of divisors: 4,368
φ(n) — Euler's totient: 1,584
Sum of prime factors: 42

Primality

Prime factorization: 3 ² × 13 × 23

Nearest primes: 2,689 (−2) · 2,693 (+2)

Divisors & multiples

All divisors (12)

1 · 3 · 9 · 13 · 23 · 39 · 69 · 117 · 207 · 299 · 897 · 2691

Aliquot sum (sum of proper divisors): 1,677

Factor pairs (a × b = 2,691)

1 × 2691

3 × 897

9 × 299

13 × 207

23 × 117

39 × 69

First multiples

2,691 · 5,382 (double) · 8,073 · 10,764 · 13,455 · 16,146 · 18,837 · 21,528 · 24,219 · 26,910

Sums & aliquot sequence

As consecutive integers: 1,345 + 1,346 896 + 897 + 898 446 + 447 + 448 + 449 + 450 + 451 295 + 296 + … + 303

Aliquot sequence: 2,691 → 1,677 → 787 → 1 → 0 — terminates at zero

Continued fraction of √n

√2,691 = [51; (1, 6, 1, 102)]

Period length 4 — the block in parentheses repeats forever.

Representations

In words: two thousand six hundred ninety-one
Ordinal: 2691st
Roman numeral: MMDCXCI
Binary: 101010000011
Octal: 5203
Hexadecimal: 0xA83
Base64: CoM=
One's complement: 62,844 (16-bit)
Scientific notation: 2.691 × 10³
As a duration: 2,691 s = 44 minutes, 51 seconds

In other bases

ternary (3) 10200200

quaternary (4) 222003

quinary (5) 41231

senary (6) 20243

septenary (7) 10563

nonary (9) 3620

undecimal (11) 2027

duodecimal (12) 1683

tridecimal (13) 12c0

tetradecimal (14) da3

pentadecimal (15) be6

As an angle

2,691° = 7 × 360° + 171°

171° ≈ 2.985 rad

Compass bearing: S (south)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵βχϟαʹ
Mayan (base 20): 𝋦·𝋮·𝋫
Chinese: 二千六百九十一
Chinese (financial): 貳仟陸佰玖拾壹

In other modern scripts

Eastern Arabic ٢٦٩١ Devanagari २६९१ Bengali ২৬৯১ Tamil ௨௬௯௧ Thai ๒๖๙๑ Tibetan ༢༦༩༡ Khmer ២៦៩១ Lao ໒໖໙໑ Burmese ၂၆၉၁

Digit at this position in famous constants

π — Pi (π): Digit 2,691 = 2
e — Euler's number (e): Digit 2,691 = 4
φ — Golden ratio (φ): Digit 2,691 = 0
√2 — Pythagoras's (√2): Digit 2,691 = 4
ln 2 — Natural log of 2: Digit 2,691 = 8
γ — Euler-Mascheroni (γ): Digit 2,691 = 8

Also seen as

Unicode codepoint

ઃ

Gujarati Sign Visarga

U+0A83

Spacing combining mark (Mc)

UTF-8 encoding: E0 AA 83 (3 bytes).

Lookup U+0A83 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000A83

RGB(0, 10, 131)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.10.131.

Address: 0.0.10.131
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.10.131

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

Musical pitch

Heard as a frequency, 2,691 Hz is closest to:

Concert pitch (A4 = 440 Hz): E7 (2637 Hz, +35¢)
Scientific pitch (C4 = 256 Hz): F7 (2733.8 Hz, -27¢)
Baroque pitch (A4 = 415 Hz): F7 (2635.1 Hz, +36¢)

Position in π

The digit sequence 2691 first appears in π at position 2,973 of the decimal expansion (the 2,973ordinal-suffix:rd 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 2691 on Pi Search ↗