2,143
2,143 is a prime, odd.
2,143 (two thousand one hundred forty-three) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MMCXLIII and in binary, 100001011111.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 10
- Digit product
- 24
- Digital root
- 1
- Palindrome
- No
- Bit width
- 12 bits
- Reversed
- 3,412
- Recamán's sequence
- a(3,465) = 2,143
- Square (n²)
- 4,592,449
- Cube (n³)
- 9,841,618,207
- Divisor count
- 2
- σ(n) — sum of divisors
- 2,144
- φ(n) — Euler's totient
- 2,142
Primality
2,143 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√2,143 = [46; (3, 2, 2, 1, 1, 3, 1, 4, 1, 1, 1, 45, 1, 1, 1, 4, 1, 3, 1, 1, 2, 2, 3, 92)]
Period length 24 — the block in parentheses repeats forever.
Representations
- In words
- two thousand one hundred forty-three
- Ordinal
- 2143rd
- Roman numeral
- MMCXLIII
- Binary
- 100001011111
- Octal
- 4137
- Hexadecimal
- 0x85F
- Base64
- CF8=
- One's complement
- 63,392 (16-bit)
- Scientific notation
- 2.143 × 10³
- As a duration
- 2,143 s = 35 minutes, 43 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵βρμγʹ
- Mayan (base 20)
- 𝋥·𝋧·𝋣
- Chinese
- 二千一百四十三
- Chinese (financial)
- 貳仟壹佰肆拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,143 = 1
- e — Euler's number (e)
- Digit 2,143 = 0
- φ — Golden ratio (φ)
- Digit 2,143 = 2
- √2 — Pythagoras's (√2)
- Digit 2,143 = 0
- ln 2 — Natural log of 2
- Digit 2,143 = 1
- γ — Euler-Mascheroni (γ)
- Digit 2,143 = 2
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.0.8.95.
- Address
- 0.0.8.95
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.8.95
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 2,143 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C7 (2093 Hz, +41¢)
- Scientific pitch (C4 = 256 Hz): C♯7 (2169.8 Hz, -22¢)
- Baroque pitch (A4 = 415 Hz): C♯7 (2091.5 Hz, +42¢)
The digit sequence 2143 first appears in π at position 23,786 of the decimal expansion (the 23,786ordinal-suffix:th 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
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.