Number

557

557 is a prime, odd, a calendar year.

Arithmetic Number Chen Prime Deficient Number Odious Number Pernicious Number Prime Pythagorean Prime Recamán's Sequence Sexy Prime Squarefree Year

Historical context — 557 AD

Calendar year

Year 557 (DLVII) was a common year starting on Monday of the Julian calendar.

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Historical context — 557 BC

Calendar year

The year 557 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, 557
Ended on: Saturday
December 31, 557
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 550s
550–559
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,469
1469 years before 2026.

In other calendars

Hebrew: 4317 / 4318 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Ox
Sexagenary cycle position 14 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1100 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 549 / 550 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 479 / 478 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 17
Digit product: 175
Digital root: 8
Palindrome: No
Bit width: 10 bits
Reversed: 755
Recamán's sequence: a(1,145) = 557
Square (n²): 310,249
Cube (n³): 172,808,693
Divisor count: 2
σ(n) — sum of divisors: 558
φ(n) — Euler's totient: 556

Primality

557 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 557

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 557)

1 × 557

First multiples

557 · 1,114 (double) · 1,671 · 2,228 · 2,785 · 3,342 · 3,899 · 4,456 · 5,013 · 5,570

Sums & aliquot sequence

As a sum of two squares: 14² + 19²

As consecutive integers: 278 + 279

Representations

In words: five hundred fifty-seven
Ordinal: 557th
Roman numeral: DLVII
Binary: 1000101101
Octal: 1055
Hexadecimal: 0x22D
Base64: Ai0=
One's complement: 64,978 (16-bit)

In other bases

ternary (3) 202122

quaternary (4) 20231

quinary (5) 4212

senary (6) 2325

septenary (7) 1424

nonary (9) 678

undecimal (11) 467

duodecimal (12) 3a5

tridecimal (13) 33b

tetradecimal (14) 2bb

pentadecimal (15) 272

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): φνζʹ
Mayan (base 20): 𝋡·𝋧·𝋱
Chinese: 五百五十七
Chinese (financial): 伍佰伍拾柒

In other modern scripts

Eastern Arabic ٥٥٧ Devanagari ५५७ Bengali ৫৫৭ Tamil ௫௫௭ Thai ๕๕๗ Tibetan ༥༥༧ Khmer ៥៥៧ Lao ໕໕໗ Burmese ၅၅၇

Digit at this position in famous constants

π — Pi (π): Digit 557 = 7
e — Euler's number (e): Digit 557 = 3
φ — Golden ratio (φ): Digit 557 = 7
√2 — Pythagoras's (√2): Digit 557 = 5
ln 2 — Natural log of 2: Digit 557 = 1
γ — Euler-Mascheroni (γ): Digit 557 = 2

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 547 (gap of 10)
Next prime: 563 (gap of 6)

Pair status: sexy with 563.

Unicode codepoint

Latin Small Letter O With Tilde And Macron

U+022D

Lowercase letter (Ll)

UTF-8 encoding: C8 AD (2 bytes).

Lookup U+022D on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00022D

RGB(0, 2, 45)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.45.

Address: 0.0.2.45
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.45

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