Number

122

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

Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 122 AD

Calendar year

Year 122 (CXXII) was a common year starting on Wednesday of the Julian calendar.

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

Historical context — 122 BC

Calendar year

Year 122 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: 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

Parity: Even
Digit count: 3
Digit sum: 5
Digit product: 4
Digital root: 5
Palindrome: No
Bit width: 7 bits
Reversed: 221
Recamán's sequence: a(156) = 122
Square (n²): 14,884
Cube (n³): 1,815,848
Divisor count: 4
σ(n) — sum of divisors: 186
φ(n) — Euler's totient: 60
Sum of prime factors: 63

Primality

Prime factorization: 2 × 61

Nearest primes: 113 (−9) · 127 (+5)

Divisors & multiples

All divisors (4)

1 · 2 · 61 (half) · 122

Aliquot sum (sum of proper divisors): 64

Factor pairs (a × b = 122)

1 × 122

2 × 61

First multiples

122 · 244 (double) · 366 · 488 · 610 · 732 · 854 · 976 · 1,098 · 1,220

Sums & aliquot sequence

As a sum of two squares: 1² + 11²

As consecutive integers: 29 + 30 + 31 + 32

Aliquot sequence: 122 → 64 → 63 → 41 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 11112

quaternary (4) 1322

quinary (5) 442

senary (6) 322

septenary (7) 233

nonary (9) 145

undecimal (11) 101

duodecimal (12) a2

tridecimal (13) 95

tetradecimal (14) 8a

pentadecimal (15) 82

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

In other modern scripts

Eastern Arabic ١٢٢ Devanagari १२२ Bengali ১২২ Tamil ௧௨௨ Thai ๑๒๒ Tibetan ༡༢༢ Khmer ១២២ Lao ໑໒໒ Burmese ၁၂၂

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 decomposition

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

ASCII character

As an ASCII codepoint, 122 is z. Printable ASCII character z.

Hex color

#00007A

RGB(0, 0, 122)

IPv4 address

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.