Number

29

29 is a prime, odd, a calendar year.

Arithmetic Number Chen Prime Deficient Number Evil Number Lucas Pell Number Perrin Number Prime Pythagorean Prime Recamán's Sequence Sexy Prime Sophie Germain Prime Squarefree Twin Prime Year

Historical context — 29 AD

Calendar year

AD 29 (XXIX) was a common year starting on Saturday of the Julian calendar.

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Historical context — 29 BC

Calendar year

Year 29 BC was either a common year starting on Friday or Saturday or a leap year starting on Thursday, Friday or Saturday of the Julian calendar and a leap year starting on Thursday of the Proleptic Julian 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: Monday
January 1, 29
Ended on: Monday
December 31, 29
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 20s
20–29
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,997
1997 years before 2026.

In other calendars

Hebrew: 3789 / 3790 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 572 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 21 / 22 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): -49 / -50 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 2
Digit sum: 11
Digit product: 18
Digital root: 2
Palindrome: No
Bit width: 5 bits
Reversed: 92
Recamán's sequence: a(58) = 29
Square (n²): 841
Cube (n³): 24,389
Divisor count: 2
σ(n) — sum of divisors: 30
φ(n) — Euler's totient: 28

Primality

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

Divisors & multiples

All divisors (2)

1 · 29

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 29)

1 × 29

First multiples

29 · 58 (double) · 87 · 116 · 145 · 174 · 203 · 232 · 261 · 290

Sums & aliquot sequence

As a sum of two squares: 2² + 5²

As consecutive integers: 14 + 15

Representations

In words: twenty-nine
Ordinal: 29th
Roman numeral: XXIX
Binary: 11101
Octal: 35
Hexadecimal: 0x1D
Base64: HQ==
One's complement: 226 (8-bit)

In other bases

ternary (3) 1002

quaternary (4) 131

quinary (5) 104

senary (6) 45

septenary (7) 41

nonary (9) 32

undecimal (11) 27

duodecimal (12) 25

tridecimal (13) 23

tetradecimal (14) 21

pentadecimal (15) 1e

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): κθʹ
Mayan (base 20): 𝋡·𝋩
Chinese: 二十九
Chinese (financial): 貳拾玖

In other modern scripts

Eastern Arabic ٢٩ Devanagari २९ Bengali ২৯ Tamil ௨௯ Thai ๒๙ Tibetan ༢༩ Khmer ២៩ Lao ໒໙ Burmese ၂၉

Digit at this position in famous constants

π — Pi (π): Digit 29 = 2
e — Euler's number (e): Digit 29 = 3
φ — Golden ratio (φ): Digit 29 = 3
√2 — Pythagoras's (√2): Digit 29 = 2
ln 2 — Natural log of 2: Digit 29 = 4
γ — Euler-Mascheroni (γ): Digit 29 = 0

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 23 (gap of 6)
Next prime: 31 (gap of 2)

Pair status: twin with 31, sexy with 23.

ASCII character

As an ASCII codepoint, 29 is control character (0x1D). ASCII control character.

Hex color

#00001D

RGB(0, 0, 29)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.29.

Address: 0.0.0.29
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.29

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

US numbered highway

Matches numbered highway designation:

I-29 — Kansas City, MO to Pembina, ND (Canadian border).

Interstate 29 on Wikipedia ↗