135,721
135,721 is a prime, odd.
135,721 (one hundred thirty-five thousand seven hundred twenty-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x21229.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 19
- Digit product
- 210
- Digital root
- 1
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 127,531
- Square (n²)
- 18,420,189,841
- Cube (n³)
- 2,500,006,585,410,361
- Divisor count
- 2
- σ(n) — sum of divisors
- 135,722
- φ(n) — Euler's totient
- 135,720
Primality
135,721 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√135,721 = [368; (2, 2, 11, 1, 2, 8, 1, 6, 1, 1, 4, 1, 1, 4, 1, 3, 56, 2, 2, 2, 6, 2, 1, 10, …)]
Representations
- In words
- one hundred thirty-five thousand seven hundred twenty-one
- Ordinal
- 135721st
- Binary
- 100001001000101001
- Octal
- 411051
- Hexadecimal
- 0x21229
- Base64
- AhIp
- One's complement
- 4,294,831,574 (32-bit)
- Scientific notation
- 1.35721 × 10⁵
- As a duration
- 135,721 s = 1 day, 13 hours, 42 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλεψκαʹ
- Mayan (base 20)
- 𝋰·𝋳·𝋦·𝋡
- Chinese
- 一十三萬五千七百二十一
- Chinese (financial)
- 壹拾參萬伍仟柒佰貳拾壹
Also seen as
UTF-8 encoding: F0 A1 88 A9 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.18.41.
- Address
- 0.2.18.41
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.18.41
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 135,721 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
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.