131,721
131,721 is a composite number, odd.
131,721 (one hundred thirty-one thousand seven hundred twenty-one) is an odd 6-digit number. It is a composite number with 12 divisors, and factors as 3 × 23² × 83. Written other ways, in hexadecimal, 0x20289.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 15
- Digit product
- 42
- Digital root
- 6
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 127,131
- Recamán's sequence
- a(228,930) = 131,721
- Square (n²)
- 17,350,421,841
- Cube (n³)
- 2,285,414,915,318,361
- Divisor count
- 12
- σ(n) — sum of divisors
- 185,808
- φ(n) — Euler's totient
- 82,984
- Sum of prime factors
- 132
Primality
Prime factorization: 3 × 23 2 × 83
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√131,721 = [362; (1, 14, 8, 11, 4, 1, 1, 2, 5, 2, 2, 2, 5, 2, 1, 1, 4, 11, 8, 14, 1, 724)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-one thousand seven hundred twenty-one
- Ordinal
- 131721st
- Binary
- 100000001010001001
- Octal
- 401211
- Hexadecimal
- 0x20289
- Base64
- AgKJ
- One's complement
- 4,294,835,574 (32-bit)
- Scientific notation
- 1.31721 × 10⁵
- As a duration
- 131,721 s = 1 day, 12 hours, 35 minutes, 21 seconds
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλαψκαʹ
- Mayan (base 20)
- 𝋰·𝋩·𝋦·𝋡
- Chinese
- 一十三萬一千七百二十一
- Chinese (financial)
- 壹拾參萬壹仟柒佰貳拾壹
Also seen as
UTF-8 encoding: F0 A0 8A 89 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.2.137.
- Address
- 0.2.2.137
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.2.137
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 131,721 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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.