2,689
2,689 is a prime, odd.
2,689 (two thousand six hundred eighty-nine) 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 MMDCLXXXIX and in binary, 101010000001.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 25
- Digit product
- 864
- Digital root
- 7
- Palindrome
- No
- Bit width
- 12 bits
- Reversed
- 9,862
- Recamán's sequence
- a(993) = 2,689
- Square (n²)
- 7,230,721
- Cube (n³)
- 19,443,408,769
- Divisor count
- 2
- σ(n) — sum of divisors
- 2,690
- φ(n) — Euler's totient
- 2,688
Primality
2,689 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√2,689 = [51; (1, 5, 1, 12, 9, 2, 1, 5, 1, 4, 11, 3, 6, 1, 1, 2, 3, 1, 3, 14, 1, 1, 4, 2, …)]
Representations
- In words
- two thousand six hundred eighty-nine
- Ordinal
- 2689th
- Roman numeral
- MMDCLXXXIX
- Binary
- 101010000001
- Octal
- 5201
- Hexadecimal
- 0xA81
- Base64
- CoE=
- One's complement
- 62,846 (16-bit)
- Scientific notation
- 2.689 × 10³
- As a duration
- 2,689 s = 44 minutes, 49 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵βχπθʹ
- Mayan (base 20)
- 𝋦·𝋮·𝋩
- Chinese
- 二千六百八十九
- Chinese (financial)
- 貳仟陸佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,689 = 1
- e — Euler's number (e)
- Digit 2,689 = 7
- φ — Golden ratio (φ)
- Digit 2,689 = 6
- √2 — Pythagoras's (√2)
- Digit 2,689 = 9
- ln 2 — Natural log of 2
- Digit 2,689 = 1
- γ — Euler-Mascheroni (γ)
- Digit 2,689 = 4
Also seen as
UTF-8 encoding: E0 AA 81 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.10.129.
- Address
- 0.0.10.129
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.10.129
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 2,689 Hz is closest to:
- Concert pitch (A4 = 440 Hz): E7 (2637 Hz, +34¢)
- Scientific pitch (C4 = 256 Hz): F7 (2733.8 Hz, -29¢)
- Baroque pitch (A4 = 415 Hz): F7 (2635.1 Hz, +35¢)
The digit sequence 2689 first appears in π at position 13,112 of the decimal expansion (the 13,112ordinal-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.