Number

1,525

1,525 is a composite number, odd, a calendar year.

Deficient Number Evil Number Heptagonal Recamán's Sequence Year

Notable events — 1525 AD

Feb 24 Spanish-Imperial forces capture Francis I of France at Pavia.
May 15 Peasants are crushed at Frankenhausen, ending the main German revolt.
Apr 21 Babur defeats Ibrahim Lodi at Panipat, founding the Mughal Empire (note: 1526).

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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 1525
Ended on: Thursday
December 31, 1525
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 1520s
1520–1529
Century: 16th century
1501–1600
Millennium: 2nd millennium
1001–2000
Years ago: 501
501 years before 2026.

In other calendars

Hebrew: 5285 / 5286 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 931 / 932 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2068 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 903 / 904 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1517 / 1518 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1447 / 1446 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 13
Digit product: 50
Digital root: 4
Palindrome: No
Bit width: 11 bits
Reversed: 5,251
Recamán's sequence: a(1,510) = 1,525
Square (n²): 2,325,625
Cube (n³): 3,546,578,125
Divisor count: 6
σ(n) — sum of divisors: 1,922
φ(n) — Euler's totient: 1,200
Sum of prime factors: 71

Primality

Prime factorization: 5 ² × 61

Nearest primes: 1,523 (−2) · 1,531 (+6)

Divisors & multiples

All divisors (6)

1 · 5 · 25 · 61 · 305 · 1525

Aliquot sum (sum of proper divisors): 397

Factor pairs (a × b = 1,525)

1 × 1525

5 × 305

25 × 61

First multiples

1,525 · 3,050 (double) · 4,575 · 6,100 · 7,625 · 9,150 · 10,675 · 12,200 · 13,725 · 15,250

Sums & aliquot sequence

As a sum of two squares: 2² + 39² = 9² + 38² = 25² + 30²

As consecutive integers: 762 + 763 303 + 304 + 305 + 306 + 307 148 + 149 + … + 157 49 + 50 + … + 73

Aliquot sequence: 1,525 → 397 → 1 → 0 — terminates at zero

Representations

In words: one thousand five hundred twenty-five
Ordinal: 1525th
Roman numeral: MDXXV
Binary: 10111110101
Octal: 2765
Hexadecimal: 0x5F5
Base64: BfU=
One's complement: 64,010 (16-bit)

In other bases

ternary (3) 2002111

quaternary (4) 113311

quinary (5) 22100

senary (6) 11021

septenary (7) 4306

nonary (9) 2074

undecimal (11) 1167

duodecimal (12) a71

tridecimal (13) 904

tetradecimal (14) 7ad

pentadecimal (15) 6ba

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αφκεʹ
Mayan (base 20): 𝋣·𝋰·𝋥
Chinese: 一千五百二十五
Chinese (financial): 壹仟伍佰貳拾伍

In other modern scripts

Eastern Arabic ١٥٢٥ Devanagari १५२५ Bengali ১৫২৫ Tamil ௧௫௨௫ Thai ๑๕๒๕ Tibetan ༡༥༢༥ Khmer ១៥២៥ Lao ໑໕໒໕ Burmese ၁၅၂၅

Digit at this position in famous constants

π — Pi (π): Digit 1,525 = 6
e — Euler's number (e): Digit 1,525 = 8
φ — Golden ratio (φ): Digit 1,525 = 7
√2 — Pythagoras's (√2): Digit 1,525 = 1
ln 2 — Natural log of 2: Digit 1,525 = 3
γ — Euler-Mascheroni (γ): Digit 1,525 = 6

Also seen as

Hex color

#0005F5

RGB(0, 5, 245)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.245.

Address: 0.0.5.245
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.5.245

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

Position in π

The digit sequence 1525 first appears in π at position 11,171 of the decimal expansion (the 11,171ordinal-suffix:st 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 1525 on Pi Search ↗