Number

451

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

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

Notable events — 451 AD

Jun 20 Roman and Visigothic forces halt Attila the Hun at the Battle of the Catalaunian Plains.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Historical context — 451 BC

Calendar year

Year 451 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

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: Sunday
January 1, 451
Ended on: Sunday
December 31, 451
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 450s
450–459
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,575
1575 years before 2026.

In other calendars

Hebrew: 4211 / 4212 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Rabbit
Sexagenary cycle position 28 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 994 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 443 / 444 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 373 / 372 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 10
Digit product: 20
Digital root: 1
Palindrome: No
Bit width: 9 bits
Reversed: 154
Recamán's sequence: a(194) = 451
Square (n²): 203,401
Cube (n³): 91,733,851
Divisor count: 4
σ(n) — sum of divisors: 504
φ(n) — Euler's totient: 400
Sum of prime factors: 52

Primality

Prime factorization: 11 × 41

Nearest primes: 449 (−2) · 457 (+6)

Divisors & multiples

All divisors (4)

1 · 11 · 41 · 451

Aliquot sum (sum of proper divisors): 53

Factor pairs (a × b = 451)

1 × 451

11 × 41

First multiples

451 · 902 (double) · 1,353 · 1,804 · 2,255 · 2,706 · 3,157 · 3,608 · 4,059 · 4,510

Sums & aliquot sequence

As consecutive integers: 225 + 226 36 + 37 + … + 46 10 + 11 + … + 31

Aliquot sequence: 451 → 53 → 1 → 0 — terminates at zero

Representations

In words: four hundred fifty-one
Ordinal: 451st
Roman numeral: CDLI
Binary: 111000011
Octal: 703
Hexadecimal: 0x1C3
Base64: AcM=
One's complement: 65,084 (16-bit)

In other bases

ternary (3) 121201

quaternary (4) 13003

quinary (5) 3301

senary (6) 2031

septenary (7) 1213

nonary (9) 551

undecimal (11) 380

duodecimal (12) 317

tridecimal (13) 289

tetradecimal (14) 243

pentadecimal (15) 201

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): υναʹ
Mayan (base 20): 𝋡·𝋢·𝋫
Chinese: 四百五十一
Chinese (financial): 肆佰伍拾壹

In other modern scripts

Eastern Arabic ٤٥١ Devanagari ४५१ Bengali ৪৫১ Tamil ௪௫௧ Thai ๔๕๑ Tibetan ༤༥༡ Khmer ៤៥១ Lao ໔໕໑ Burmese ၄၅၁

Digit at this position in famous constants

π — Pi (π): Digit 451 = 8
e — Euler's number (e): Digit 451 = 6
φ — Golden ratio (φ): Digit 451 = 3
√2 — Pythagoras's (√2): Digit 451 = 2
ln 2 — Natural log of 2: Digit 451 = 3
γ — Euler-Mascheroni (γ): Digit 451 = 4

Also seen as

Unicode codepoint

Latin Letter Retroflex Click

U+01C3

Other letter (Lo)

UTF-8 encoding: C7 83 (2 bytes).

Lookup U+01C3 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0001C3

RGB(0, 1, 195)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.195.

Address: 0.0.1.195
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.195

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