Live analysis

5,721

5,721 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.).

5,721 (five thousand seven hundred twenty-one) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 3 × 1,907. Written other ways, in hexadecimal, 0x1659.

Arithmetic Number Cube-Free Deficient Number Happy Number Odious Number Pernicious Number Recamán's Sequence Self Number Semiprime Squarefree

Interestingness

★ ★ ★ ★ ☆

7 notable facts · grade B

5,709 5,710 5,711 5,712 5,713 5,714 5,715 5,716 5,717 5,718 5,719 5,720 5,721 5,722 5,723 5,724 5,725 5,726 5,727 5,728 5,729 5,730 5,731 5,732 5,733

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 15
Digit product: 70
Digital root: 6
Palindrome: No
Bit width: 13 bits
Reversed: 1,275
Recamán's sequence: a(3,690) = 5,721
Square (n²): 32,729,841
Cube (n³): 187,247,420,361
Divisor count: 4
σ(n) — sum of divisors: 7,632
φ(n) — Euler's totient: 3,812
Sum of prime factors: 1,910

Primality

Prime factorization: 3 × 1907

Nearest primes: 5,717 (−4) · 5,737 (+16)

Divisors & multiples

All divisors (4)

1 · 3 · 1907 · 5721

Aliquot sum (sum of proper divisors): 1,911

Factor pairs (a × b = 5,721)

1 × 5721

3 × 1907

First multiples

5,721 · 11,442 (double) · 17,163 · 22,884 · 28,605 · 34,326 · 40,047 · 45,768 · 51,489 · 57,210

Sums & aliquot sequence

As consecutive integers: 2,860 + 2,861 1,906 + 1,907 + 1,908 951 + 952 + 953 + 954 + 955 + 956

Aliquot sequence: 5,721 → 1,911 → 1,281 → 703 → 57 → 23 → 1 → 0 — terminates at zero

Continued fraction of √n

√5,721 = [75; (1, 1, 1, 3, 8, 1, 1, 1, 2, 21, 4, 3, 1, 1, 1, 2, 1, 1, 18, 3, 29, 1, 12, 1, …)]

Representations

In words: five thousand seven hundred twenty-one
Ordinal: 5721st
Binary: 1011001011001
Octal: 13131
Hexadecimal: 0x1659
Base64: Flk=
One's complement: 59,814 (16-bit)
Scientific notation: 5.721 × 10³
As a duration: 5,721 s = 1 hour, 35 minutes, 21 seconds

In other bases

ternary (3) 21211220

quaternary (4) 1121121

quinary (5) 140341

senary (6) 42253

septenary (7) 22452

nonary (9) 7756

undecimal (11) 4331

duodecimal (12) 3389

tridecimal (13) 27b1

tetradecimal (14) 2129

pentadecimal (15) 1a66

Palindromic in base 8

As an angle

5,721° = 15 × 360° + 321°

321° ≈ 5.603 rad

Compass bearing: NW (northwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
Greek (Milesian): ͵εψκαʹ
Mayan (base 20): 𝋮·𝋦·𝋡
Chinese: 五千七百二十一
Chinese (financial): 伍仟柒佰貳拾壹

In other modern scripts

Eastern Arabic ٥٧٢١ Devanagari ५७२१ Bengali ৫৭২১ Tamil ௫௭௨௧ Thai ๕๗๒๑ Tibetan ༥༧༢༡ Khmer ៥៧២១ Lao ໕໗໒໑ Burmese ၅၇၂၁

Digit at this position in famous constants

π — Pi (π): Digit 5,721 = 2
e — Euler's number (e): Digit 5,721 = 9
φ — Golden ratio (φ): Digit 5,721 = 3
√2 — Pythagoras's (√2): Digit 5,721 = 9
ln 2 — Natural log of 2: Digit 5,721 = 8
γ — Euler-Mascheroni (γ): Digit 5,721 = 7

Also seen as

Unicode codepoint

ᙙ

Canadian Syllabics Carrier Sha

U+1659

Other letter (Lo)

UTF-8 encoding: E1 99 99 (3 bytes).

Lookup U+1659 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#001659

RGB(0, 22, 89)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.22.89.

Address: 0.0.22.89
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.22.89

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

Musical pitch

Heard as a frequency, 5,721 Hz is closest to:

Concert pitch (A4 = 440 Hz): F8 (5587.7 Hz, +41¢)
Scientific pitch (C4 = 256 Hz): F♯8 (5792.6 Hz, -22¢)
Baroque pitch (A4 = 415 Hz): F♯8 (5583.6 Hz, +42¢)

Position in π

The digit sequence 5721 first appears in π at position 5,670 of the decimal expansion (the 5,670ordinal-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 5721 on Pi Search ↗