Number

501

501 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Odious Number Pernicious Number Recamán's Sequence Self Number Semiprime Squarefree Year

Historical context — 501 AD

Calendar year

Year 501 (DI) was a common year starting on Monday of the Julian calendar.

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Historical context — 501 BC

Calendar year

The year 501 BC was a year of the pre-Julian Roman calendar.

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Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Saturday
January 1, 501
Ended on: Saturday
December 31, 501
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 500s
500–509
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,525
1525 years before 2026.

In other calendars

Hebrew: 4261 / 4262 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Snake
Sexagenary cycle position 18 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1044 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 493 / 494 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 423 / 422 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 6
Digit product: 0
Digital root: 6
Palindrome: No
Bit width: 9 bits
Reversed: 105
Recamán's sequence: a(258) = 501
Square (n²): 251,001
Cube (n³): 125,751,501
Divisor count: 4
σ(n) — sum of divisors: 672
φ(n) — Euler's totient: 332
Sum of prime factors: 170

Primality

Prime factorization: 3 × 167

Nearest primes: 499 (−2) · 503 (+2)

Divisors & multiples

All divisors (4)

1 · 3 · 167 · 501

Aliquot sum (sum of proper divisors): 171

Factor pairs (a × b = 501)

1 × 501

3 × 167

First multiples

501 · 1,002 (double) · 1,503 · 2,004 · 2,505 · 3,006 · 3,507 · 4,008 · 4,509 · 5,010

Sums & aliquot sequence

As consecutive integers: 250 + 251 166 + 167 + 168 81 + 82 + 83 + 84 + 85 + 86

Aliquot sequence: 501 → 171 → 89 → 1 → 0 — terminates at zero

Representations

In words: five hundred one
Ordinal: 501st
Roman numeral: DI
Binary: 111110101
Octal: 765
Hexadecimal: 0x1F5
Base64: AfU=
One's complement: 65,034 (16-bit)

In other bases

ternary (3) 200120

quaternary (4) 13311

quinary (5) 4001

senary (6) 2153

septenary (7) 1314

nonary (9) 616

undecimal (11) 416

duodecimal (12) 359

tridecimal (13) 2c7

tetradecimal (14) 27b

pentadecimal (15) 236

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓏺
Greek (Milesian): φαʹ
Mayan (base 20): 𝋡·𝋥·𝋡
Chinese: 五百零一
Chinese (financial): 伍佰零壹

In other modern scripts

Eastern Arabic ٥٠١ Devanagari ५०१ Bengali ৫০১ Tamil ௫௦௧ Thai ๕๐๑ Tibetan ༥༠༡ Khmer ៥០១ Lao ໕໐໑ Burmese ၅၀၁

Digit at this position in famous constants

π — Pi (π): Digit 501 = 2
e — Euler's number (e): Digit 501 = 2
φ — Golden ratio (φ): Digit 501 = 0
√2 — Pythagoras's (√2): Digit 501 = 3
ln 2 — Natural log of 2: Digit 501 = 6
γ — Euler-Mascheroni (γ): Digit 501 = 8

Also seen as

Unicode codepoint

Latin Small Letter G With Acute

U+01F5

Lowercase letter (Ll)

UTF-8 encoding: C7 B5 (2 bytes).

Lookup U+01F5 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0001F5

RGB(0, 1, 245)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.245.

Address: 0.0.1.245
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.245

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

NANP area code 501

The number 501 is an active NANP area code (North American Numbering Plan).

Primary area: Little Rock
Region: Arkansas
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 501 ↗