13,125
13,125 is a composite number, odd.
13,125 (thirteen thousand one hundred twenty-five) is an odd 5-digit number. It is a composite number with 20 divisors, and factors as 3 × 5⁴ × 7. Written other ways, in hexadecimal, 0x3345.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 12
- Digit product
- 30
- Digital root
- 3
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 52,131
- Recamán's sequence
- a(48,025) = 13,125
- Square (n²)
- 172,265,625
- Cube (n³)
- 2,260,986,328,125
- Divisor count
- 20
- σ(n) — sum of divisors
- 24,992
- φ(n) — Euler's totient
- 6,000
- Sum of prime factors
- 30
Primality
Prime factorization: 3 × 5 4 × 7
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√13,125 = [114; (1, 1, 3, 2, 1, 1, 1, 1, 2, 8, 1, 3, 1, 1, 2, 56, 1, 8, 5, 2, 10, 2, 5, 8, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- thirteen thousand one hundred twenty-five
- Ordinal
- 13125th
- Binary
- 11001101000101
- Octal
- 31505
- Hexadecimal
- 0x3345
- Base64
- M0U=
- One's complement
- 52,410 (16-bit)
- Scientific notation
- 1.3125 × 10⁴
- As a duration
- 13,125 s = 3 hours, 38 minutes, 45 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιγρκεʹ
- Mayan (base 20)
- 𝋡·𝋬·𝋰·𝋥
- Chinese
- 一萬三千一百二十五
- Chinese (financial)
- 壹萬參仟壹佰貳拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,125 = 2
- e — Euler's number (e)
- Digit 13,125 = 1
- φ — Golden ratio (φ)
- Digit 13,125 = 9
- √2 — Pythagoras's (√2)
- Digit 13,125 = 2
- ln 2 — Natural log of 2
- Digit 13,125 = 2
- γ — Euler-Mascheroni (γ)
- Digit 13,125 = 0
Also seen as
UTF-8 encoding: E3 8D 85 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.51.69.
- Address
- 0.0.51.69
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.51.69
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 13,125 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯9 (13289.8 Hz, -22¢)
- Scientific pitch (C4 = 256 Hz): G♯9 (13004 Hz, +16¢)
- Baroque pitch (A4 = 415 Hz): A9 (13280 Hz, -20¢)
The digit sequence 13125 first appears in π at position 70,001 of the decimal expansion (the 70,001ordinal-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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.