Number

525

525 is a composite number, odd, a calendar year.

Deficient Number Evil Number Palindrome Recamán's Sequence Self Number Year

Historical context — 525 AD

Calendar year

Year 525 (DXXV) was a common year starting on Wednesday of the Julian calendar.

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Historical context — 525 BC

Calendar year

The year 525 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, 525
Ended on: Monday
December 31, 525
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 520s
520–529
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,501
1501 years before 2026.

In other calendars

Hebrew: 4285 / 4286 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1068 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 517 / 518 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 447 / 446 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 12
Digit product: 50
Digital root: 3
Palindrome: Yes
Bit width: 10 bits
Recamán's sequence: a(1,209) = 525
Square (n²): 275,625
Cube (n³): 144,703,125
Divisor count: 12
σ(n) — sum of divisors: 992
φ(n) — Euler's totient: 240
Sum of prime factors: 20

Primality

Prime factorization: 3 × 5 ² × 7

Nearest primes: 523 (−2) · 541 (+16)

Divisors & multiples

All divisors (12)

1 · 3 · 5 · 7 · 15 · 21 · 25 · 35 · 75 · 105 · 175 · 525

Aliquot sum (sum of proper divisors): 467

Factor pairs (a × b = 525)

1 × 525

3 × 175

5 × 105

7 × 75

15 × 35

21 × 25

First multiples

525 · 1,050 (double) · 1,575 · 2,100 · 2,625 · 3,150 · 3,675 · 4,200 · 4,725 · 5,250

Sums & aliquot sequence

As consecutive integers: 262 + 263 174 + 175 + 176 103 + 104 + 105 + 106 + 107 85 + 86 + 87 + 88 + 89 + 90

Aliquot sequence: 525 → 467 → 1 → 0 — terminates at zero

Representations

In words: five hundred twenty-five
Ordinal: 525th
Roman numeral: DXXV
Binary: 1000001101
Octal: 1015
Hexadecimal: 0x20D
Base64: Ag0=
One's complement: 65,010 (16-bit)

In other bases

ternary (3) 201110

quaternary (4) 20031

quinary (5) 4100

senary (6) 2233

septenary (7) 1350

nonary (9) 643

undecimal (11) 438

duodecimal (12) 379

tridecimal (13) 315

tetradecimal (14) 297

pentadecimal (15) 250

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): φκεʹ
Mayan (base 20): 𝋡·𝋦·𝋥
Chinese: 五百二十五
Chinese (financial): 伍佰貳拾伍

In other modern scripts

Eastern Arabic ٥٢٥ Devanagari ५२५ Bengali ৫২৫ Tamil ௫௨௫ Thai ๕๒๕ Tibetan ༥༢༥ Khmer ៥២៥ Lao ໕໒໕ Burmese ၅၂၅

Digit at this position in famous constants

π — Pi (π): Digit 525 = 2
e — Euler's number (e): Digit 525 = 5
φ — Golden ratio (φ): Digit 525 = 3
√2 — Pythagoras's (√2): Digit 525 = 2
ln 2 — Natural log of 2: Digit 525 = 6
γ — Euler-Mascheroni (γ): Digit 525 = 9

Also seen as

Unicode codepoint

Latin Small Letter O With Double Grave

U+020D

Lowercase letter (Ll)

UTF-8 encoding: C8 8D (2 bytes).

Lookup U+020D on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00020D

RGB(0, 2, 13)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.13.

Address: 0.0.2.13
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.13

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