Number

31,081

31,081 is a prime, odd.

Arithmetic Number Deficient Number Emirp Odious Number Prime Pythagorean Prime Recamán's Sequence Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 5
Digit sum: 13
Digit product: 0
Digital root: 4
Palindrome: No
Bit width: 15 bits
Reversed: 18,013
Recamán's sequence: a(31,501) = 31,081
Square (n²): 966,028,561
Cube (n³): 30,025,133,704,441
Divisor count: 2
σ(n) — sum of divisors: 31,082
φ(n) — Euler's totient: 31,080

Primality

31,081 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 31081

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 31,081)

1 × 31081

First multiples

31,081 · 62,162 (double) · 93,243 · 124,324 · 155,405 · 186,486 · 217,567 · 248,648 · 279,729 · 310,810

Sums & aliquot sequence

As a sum of two squares: 84² + 155²

As consecutive integers: 15,540 + 15,541

Representations

In words: thirty-one thousand eighty-one
Ordinal: 31081st
Binary: 111100101101001
Octal: 74551
Hexadecimal: 0x7969
Base64: eWk=
One's complement: 34,454 (16-bit)

In other bases

ternary (3) 1120122011

quaternary (4) 13211221

quinary (5) 1443311

senary (6) 355521

septenary (7) 156421

nonary (9) 46564

undecimal (11) 21396

duodecimal (12) 15ba1

tridecimal (13) 111bb

tetradecimal (14) b481

pentadecimal (15) 9321

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹
Egyptian hieroglyphic: 𓂍𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵λαπαʹ
Mayan (base 20): 𝋣·𝋱·𝋮·𝋡
Chinese: 三萬一千零八十一
Chinese (financial): 參萬壹仟零捌拾壹

In other modern scripts

Eastern Arabic ٣١٠٨١ Devanagari ३१०८१ Bengali ৩১০৮১ Tamil ௩௧௦௮௧ Thai ๓๑๐๘๑ Tibetan ༣༡༠༨༡ Khmer ៣១០៨១ Lao ໓໑໐໘໑ Burmese ၃၁၀၈၁

Digit at this position in famous constants

π — Pi (π): Digit 31,081 = 3
e — Euler's number (e): Digit 31,081 = 5
φ — Golden ratio (φ): Digit 31,081 = 5
√2 — Pythagoras's (√2): Digit 31,081 = 6
ln 2 — Natural log of 2: Digit 31,081 = 3
γ — Euler-Mascheroni (γ): Digit 31,081 = 2

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 31,079 (gap of 2)
Next prime: 31,091 (gap of 10)

Pair status: twin with 31079.

Unicode codepoint

祩

CJK Unified Ideograph-7969

U+7969

Other letter (Lo)

UTF-8 encoding: E7 A5 A9 (3 bytes).

Lookup U+7969 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#007969

RGB(0, 121, 105)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.121.105.

Address: 0.0.121.105
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.121.105

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

Position in π

The digit sequence 31081 first appears in π at position 75,325 of the decimal expansion (the 75,325ordinal-suffix:th 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 31081 on Pi Search ↗