Number

5,581

5,581 is a prime, odd.

5,581 (five thousand five hundred eighty-one) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x15CD.

Arithmetic Number Chen Prime Cube-Free Deficient Number Evil Number Prime Pythagorean Prime Recamán's Sequence Squarefree Star Number

Interestingness

★ ★ ★ ★ ★

8 notable facts · grade A

5,569 5,570 5,571 5,572 5,573 5,574 5,575 5,576 5,577 5,578 5,579 5,580 5,581 5,582 5,583 5,584 5,585 5,586 5,587 5,588 5,589 5,590 5,591 5,592 5,593

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 19
Digit product: 200
Digital root: 1
Palindrome: No
Bit width: 13 bits
Reversed: 1,855
Recamán's sequence: a(3,410) = 5,581
Square (n²): 31,147,561
Cube (n³): 173,834,537,941
Divisor count: 2
σ(n) — sum of divisors: 5,582
φ(n) — Euler's totient: 5,580

Primality

5,581 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 5581

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 5,581)

1 × 5581

First multiples

5,581 · 11,162 (double) · 16,743 · 22,324 · 27,905 · 33,486 · 39,067 · 44,648 · 50,229 · 55,810

Sums & aliquot sequence

As a sum of two squares: 35² + 66²

As consecutive integers: 2,790 + 2,791

Continued fraction of √n

√5,581 = [74; (1, 2, 2, 2, 16, 5, 3, 1, 1, 1, 2, 1, 2, 6, 1, 2, 1, 29, 7, 12, 3, 4, 4, 1, …)]

Representations

In words: five thousand five hundred eighty-one
Ordinal: 5581st
Binary: 1010111001101
Octal: 12715
Hexadecimal: 0x15CD
Base64: Fc0=
One's complement: 59,954 (16-bit)
Scientific notation: 5.581 × 10³
As a duration: 5,581 s = 1 hour, 33 minutes, 1 second

In other bases

ternary (3) 21122201

quaternary (4) 1113031

quinary (5) 134311

senary (6) 41501

septenary (7) 22162

nonary (9) 7581

undecimal (11) 4214

duodecimal (12) 3291

tridecimal (13) 2704

tetradecimal (14) 2069

pentadecimal (15) 19c1

As an angle

5,581° = 15 × 360° + 181°

181° ≈ 3.159 rad

Compass bearing: S (south)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵εφπαʹ
Mayan (base 20): 𝋭·𝋳·𝋡
Chinese: 五千五百八十一
Chinese (financial): 伍仟伍佰捌拾壹

In other modern scripts

Eastern Arabic ٥٥٨١ Devanagari ५५८१ Bengali ৫৫৮১ Tamil ௫௫௮௧ Thai ๕๕๘๑ Tibetan ༥༥༨༡ Khmer ៥៥៨១ Lao ໕໕໘໑ Burmese ၅၅၈၁

Digit at this position in famous constants

π — Pi (π): Digit 5,581 = 5
e — Euler's number (e): Digit 5,581 = 3
φ — Golden ratio (φ): Digit 5,581 = 1
√2 — Pythagoras's (√2): Digit 5,581 = 9
ln 2 — Natural log of 2: Digit 5,581 = 4
γ — Euler-Mascheroni (γ): Digit 5,581 = 0

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 5,573 (gap of 8)
Next prime: 5,591 (gap of 10)

Unicode codepoint

ᗍ

Canadian Syllabics Carrier Ree

U+15CD

Other letter (Lo)

UTF-8 encoding: E1 97 8D (3 bytes).

Lookup U+15CD on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0015CD

RGB(0, 21, 205)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.21.205.

Address: 0.0.21.205
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.21.205

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

Musical pitch

Heard as a frequency, 5,581 Hz is closest to:

Concert pitch (A4 = 440 Hz): F8 (5587.7 Hz, -2¢)
Scientific pitch (C4 = 256 Hz): F8 (5467.5 Hz, +36¢)
Baroque pitch (A4 = 415 Hz): F♯8 (5583.6 Hz, -1¢)

Position in π

The digit sequence 5581 first appears in π at position 4,072 of the decimal expansion (the 4,072ordinal-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 5581 on Pi Search ↗