Number

542

542 is a composite number, even, a calendar year.

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

Historical context — 542 AD

Calendar year

Year 542 (DXLII) was a common year starting on Wednesday of the Julian calendar.

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Historical context — 542 BC

Calendar year

The year 542 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: Monday
January 1, 542
Ended on: Monday
December 31, 542
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 540s
540–549
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,484
1484 years before 2026.

In other calendars

Hebrew: 4302 / 4303 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Dog
Sexagenary cycle position 59 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1085 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 534 / 535 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 464 / 463 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 11
Digit product: 40
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 245
Recamán's sequence: a(1,175) = 542
Square (n²): 293,764
Cube (n³): 159,220,088
Divisor count: 4
σ(n) — sum of divisors: 816
φ(n) — Euler's totient: 270
Sum of prime factors: 273

Primality

Prime factorization: 2 × 271

Nearest primes: 541 (−1) · 547 (+5)

Divisors & multiples

All divisors (4)

1 · 2 · 271 (half) · 542

Aliquot sum (sum of proper divisors): 274

Factor pairs (a × b = 542)

1 × 542

2 × 271

First multiples

542 · 1,084 (double) · 1,626 · 2,168 · 2,710 · 3,252 · 3,794 · 4,336 · 4,878 · 5,420

Sums & aliquot sequence

As consecutive integers: 134 + 135 + 136 + 137

Aliquot sequence: 542 → 274 → 140 → 196 → 203 → 37 → 1 → 0 — terminates at zero

Representations

In words: five hundred forty-two
Ordinal: 542nd
Roman numeral: DXLII
Binary: 1000011110
Octal: 1036
Hexadecimal: 0x21E
Base64: Ah4=
One's complement: 64,993 (16-bit)

In other bases

ternary (3) 202002

quaternary (4) 20132

quinary (5) 4132

senary (6) 2302

septenary (7) 1403

nonary (9) 662

undecimal (11) 453

duodecimal (12) 392

tridecimal (13) 329

tetradecimal (14) 2aa

pentadecimal (15) 262

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
Greek (Milesian): φμβʹ
Mayan (base 20): 𝋡·𝋧·𝋢
Chinese: 五百四十二
Chinese (financial): 伍佰肆拾貳

In other modern scripts

Eastern Arabic ٥٤٢ Devanagari ५४२ Bengali ৫৪২ Tamil ௫௪௨ Thai ๕๔๒ Tibetan ༥༤༢ Khmer ៥៤២ Lao ໕໔໒ Burmese ၅၄၂

Digit at this position in famous constants

π — Pi (π): Digit 542 = 1
e — Euler's number (e): Digit 542 = 6
φ — Golden ratio (φ): Digit 542 = 9
√2 — Pythagoras's (√2): Digit 542 = 0
ln 2 — Natural log of 2: Digit 542 = 6
γ — Euler-Mascheroni (γ): Digit 542 = 7

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 542, here are decompositions:

19 + 523 = 542
43 + 499 = 542
79 + 463 = 542
103 + 439 = 542
109 + 433 = 542
163 + 379 = 542
193 + 349 = 542
211 + 331 = 542

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Capital Letter H With Caron

U+021E

Uppercase letter (Lu)

UTF-8 encoding: C8 9E (2 bytes).

Lookup U+021E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00021E

RGB(0, 2, 30)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.30.

Address: 0.0.2.30
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.30

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