Number

1,955

1,955 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Odious Number Pernicious Number Recamán's Sequence Sphenic Number Squarefree Year

Notable events — 1955 AD

Apr 18 Albert Einstein dies in Princeton, age 76.
May 14 The Warsaw Pact is signed in response to West Germany joining NATO.
Jul 17 Disneyland opens in Anaheim, California.
Dec 1 Rosa Parks refuses to give up her seat in Montgomery, sparking the bus boycott.
Dec 5 The AFL and CIO merge into the AFL-CIO.

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

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, 1955
Ended on: Saturday
December 31, 1955
Friday the 13ths: 1
One Friday the 13th this year.
Easter Sunday: April 10
Sunday, April 10, 1955
Decade: 1950s
1950–1959
Century: 20th century
1901–2000
Millennium: 2nd millennium
1001–2000
Years ago: 71
71 years before 2026.

In other calendars

Hebrew: 5715 / 5716 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 1374 / 1375 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Goat
Sexagenary cycle position 32 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2498 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 1333 / 1334 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1947 / 1948 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1877 / 1876 Saka
Indian national calendar; year starts in March.
Japanese: Shōwa 30
Reign-era counting from the start of each emperor's reign.

Properties

Parity: Odd
Digit count: 4
Digit sum: 20
Digit product: 225
Digital root: 2
Palindrome: No
Bit width: 11 bits
Reversed: 5,591
Recamán's sequence: a(3,841) = 1,955
Square (n²): 3,822,025
Cube (n³): 7,472,058,875
Divisor count: 8
σ(n) — sum of divisors: 2,592
φ(n) — Euler's totient: 1,408
Sum of prime factors: 45

Primality

Prime factorization: 5 × 17 × 23

Nearest primes: 1,951 (−4) · 1,973 (+18)

Divisors & multiples

All divisors (8)

1 · 5 · 17 · 23 · 85 · 115 · 391 · 1955

Aliquot sum (sum of proper divisors): 637

Factor pairs (a × b = 1,955)

1 × 1955

5 × 391

17 × 115

23 × 85

First multiples

1,955 · 3,910 (double) · 5,865 · 7,820 · 9,775 · 11,730 · 13,685 · 15,640 · 17,595 · 19,550

Sums & aliquot sequence

As consecutive integers: 977 + 978 389 + 390 + 391 + 392 + 393 191 + 192 + … + 200 107 + 108 + … + 123

Aliquot sequence: 1,955 → 637 → 161 → 31 → 1 → 0 — terminates at zero

Representations

In words: one thousand nine hundred fifty-five
Ordinal: 1955th
Roman numeral: MCMLV
Binary: 11110100011
Octal: 3643
Hexadecimal: 0x7A3
Base64: B6M=
One's complement: 63,580 (16-bit)

In other bases

ternary (3) 2200102

quaternary (4) 132203

quinary (5) 30310

senary (6) 13015

septenary (7) 5462

nonary (9) 2612

undecimal (11) 1518

duodecimal (12) 116b

tridecimal (13) b75

tetradecimal (14) 9d9

pentadecimal (15) 8a5

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αϡνεʹ
Mayan (base 20): 𝋤·𝋱·𝋯
Chinese: 一千九百五十五
Chinese (financial): 壹仟玖佰伍拾伍

In other modern scripts

Eastern Arabic ١٩٥٥ Devanagari १९५५ Bengali ১৯৫৫ Tamil ௧௯௫௫ Thai ๑๙๕๕ Tibetan ༡༩༥༥ Khmer ១៩៥៥ Lao ໑໙໕໕ Burmese ၁၉၅၅

Digit at this position in famous constants

π — Pi (π): Digit 1,955 = 7
e — Euler's number (e): Digit 1,955 = 1
φ — Golden ratio (φ): Digit 1,955 = 7
√2 — Pythagoras's (√2): Digit 1,955 = 6
ln 2 — Natural log of 2: Digit 1,955 = 3
γ — Euler-Mascheroni (γ): Digit 1,955 = 9

Also seen as

Unicode codepoint

Thaana Letter Ghainu

U+07A3

Other letter (Lo)

UTF-8 encoding: DE A3 (2 bytes).

Lookup U+07A3 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0007A3

RGB(0, 7, 163)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.163.

Address: 0.0.7.163
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.7.163

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

Position in π

The digit sequence 1955 first appears in π at position 21,503 of the decimal expansion (the 21,503ordinal-suffix:rd digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1955 on Pi Search ↗