501
501 is a composite number, odd, a calendar year.
501 (five hundred one) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 3 × 167. Written other ways, in Roman numerals it is DI and in binary, 111110101.
Interestingness
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
Primality
Prime factorization: 3 × 167
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√501 = [22; (2, 1, 1, 1, 1, 3, 8, 1, 2, 10, 1, 5, 2, 14, 2, 5, 1, 10, 2, 1, 8, 3, 1, 1, …)]
Period length 28 — the block in parentheses repeats forever.
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)
- Scientific notation
- 5.01 × 10²
- As a duration
- 501 s = 8 minutes, 21 seconds
As an angle
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
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
UTF-8 encoding: C7 B5 (2 bytes).
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.
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.
Heard as a frequency, 501 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B4 (493.9 Hz, +25¢)
- Scientific pitch (C4 = 256 Hz): C5 (512 Hz, -38¢)
- Baroque pitch (A4 = 415 Hz): C5 (493.5 Hz, +26¢)
On an ingredients label, E501 is Potassium carbonates, an acidity regulator or anti-caking agent.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.