122
122 is a composite number, even, a calendar year.
122 (one hundred twenty-two) is an even 3-digit number. It is a composite number with 4 divisors, and factors as 2 × 61. Written other ways, in Roman numerals it is CXXII and in binary, 1111010.
Interestingness
Historical context — 122 AD
Calendar year
Year 122 (CXXII) was a common year starting on Wednesday of the Julian calendar.
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Historical context — 122 BC
Calendar year
Year 122 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 122
- Ended on
-
Thursday
December 31, 122
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
120s
120–129
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,904
1904 years before 2026.
In other calendars
- Hebrew
-
3882 / 3883 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
-
665 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
114 / 115 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
44 / 43 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 61
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√122 = [11; (22)]
Period length 1 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-two
- Ordinal
- 122nd
- Roman numeral
- CXXII
- Binary
- 1111010
- Octal
- 172
- Hexadecimal
- 0x7A
- Base64
- eg==
- One's complement
- 133 (8-bit)
- Scientific notation
- 1.22 × 10²
- As a duration
- 122 s = 2 minutes, 2 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ρκβʹ
- Mayan (base 20)
- 𝋦·𝋢
- Chinese
- 一百二十二
- Chinese (financial)
- 壹佰貳拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 122 = 0
- e — Euler's number (e)
- Digit 122 = 8
- φ — Golden ratio (φ)
- Digit 122 = 1
- √2 — Pythagoras's (√2)
- Digit 122 = 9
- ln 2 — Natural log of 2
- Digit 122 = 6
- γ — Euler-Mascheroni (γ)
- Digit 122 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 122, here are decompositions:
- 13 + 109 = 122
- 19 + 103 = 122
- 43 + 79 = 122
- 61 + 61 = 122
As an ASCII codepoint, 122 is z. Printable ASCII character z.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.122.
- Address
- 0.0.0.122
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.122
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 122 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B2 (123.5 Hz, -21¢)
- Scientific pitch (C4 = 256 Hz): B2 (120.8 Hz, +17¢)
- Baroque pitch (A4 = 415 Hz): C3 (123.4 Hz, -19¢)
As a MIDI note number, 122 is D9 (9397.3 Hz at concert pitch).
On an ingredients label, E122 is Azorubine (carmoisine), a food colour.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.