Number

8,081

8,081 is a prime, odd.

Arithmetic Number Chen Prime Deficient Number Evil Number Flippable Happy Number Prime Pythagorean Prime Recamán's Sequence Sexy Prime Squarefree

Properties

Parity: Odd
Digit count: 4
Digit sum: 17
Digit product: 0
Digital root: 8
Palindrome: No
Bit width: 13 bits
Reversed: 1,808
Flips to (rotate 180°): 1,808
Recamán's sequence: a(2,633) = 8,081
Square (n²): 65,302,561
Cube (n³): 527,709,995,441
Divisor count: 2
σ(n) — sum of divisors: 8,082
φ(n) — Euler's totient: 8,080

Primality

8,081 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 8081

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 8,081)

1 × 8081

First multiples

8,081 · 16,162 (double) · 24,243 · 32,324 · 40,405 · 48,486 · 56,567 · 64,648 · 72,729 · 80,810

Sums & aliquot sequence

As a sum of two squares: 41² + 80²

As consecutive integers: 4,040 + 4,041

Representations

In words: eight thousand eighty-one
Ordinal: 8081st
Binary: 1111110010001
Octal: 17621
Hexadecimal: 0x1F91
Base64: H5E=
One's complement: 57,454 (16-bit)

In other bases

ternary (3) 102002022

quaternary (4) 1332101

quinary (5) 224311

senary (6) 101225

septenary (7) 32363

nonary (9) 12068

undecimal (11) 6087

duodecimal (12) 4815

tridecimal (13) 38a8

tetradecimal (14) 2d33

pentadecimal (15) 25db

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵ηπαʹ
Mayan (base 20): 𝋡·𝋠·𝋤·𝋡
Chinese: 八千零八十一
Chinese (financial): 捌仟零捌拾壹

In other modern scripts

Eastern Arabic ٨٠٨١ Devanagari ८०८१ Bengali ৮০৮১ Tamil ௮௦௮௧ Thai ๘๐๘๑ Tibetan ༨༠༨༡ Khmer ៨០៨១ Lao ໘໐໘໑ Burmese ၈၀၈၁

Digit at this position in famous constants

π — Pi (π): Digit 8,081 = 5
e — Euler's number (e): Digit 8,081 = 6
φ — Golden ratio (φ): Digit 8,081 = 7
√2 — Pythagoras's (√2): Digit 8,081 = 7
ln 2 — Natural log of 2: Digit 8,081 = 7
γ — Euler-Mascheroni (γ): Digit 8,081 = 3

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 8,069 (gap of 12)
Next prime: 8,087 (gap of 6)

Pair status: sexy with 8087.

Unicode codepoint

ᾑ

Greek Small Letter Eta With Dasia And Ypogegrammeni

U+1F91

Lowercase letter (Ll)

UTF-8 encoding: E1 BE 91 (3 bytes).

Lookup U+1F91 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#001F91

RGB(0, 31, 145)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.31.145.

Address: 0.0.31.145
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.31.145

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

Position in π

The digit sequence 8081 first appears in π at position 10,882 of the decimal expansion (the 10,882ordinal-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 8081 on Pi Search ↗