131,821
131,821 is a composite number, odd.
131,821 (one hundred thirty-one thousand eight hundred twenty-one) is an odd 6-digit number. It is a composite number with 4 divisors, and factors as 61 × 2,161. Written other ways, in hexadecimal, 0x202ED.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 16
- Digit product
- 48
- Digital root
- 7
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 128,131
- Recamán's sequence
- a(228,730) = 131,821
- Square (n²)
- 17,376,776,041
- Cube (n³)
- 2,290,623,994,500,661
- Divisor count
- 4
- σ(n) — sum of divisors
- 134,044
- φ(n) — Euler's totient
- 129,600
- Sum of prime factors
- 2,222
Primality
Prime factorization: 61 × 2161
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√131,821 = [363; (13, 1, 25, 1, 28, 12, 14, 1, 2, 1, 3, 1, 3, 4, 11, 1, 6, 1, 1, 3, 5, 3, 1, 5, …)]
Representations
- In words
- one hundred thirty-one thousand eight hundred twenty-one
- Ordinal
- 131821st
- Binary
- 100000001011101101
- Octal
- 401355
- Hexadecimal
- 0x202ED
- Base64
- AgLt
- One's complement
- 4,294,835,474 (32-bit)
- Scientific notation
- 1.31821 × 10⁵
- As a duration
- 131,821 s = 1 day, 12 hours, 37 minutes, 1 second
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλαωκαʹ
- Mayan (base 20)
- 𝋰·𝋩·𝋫·𝋡
- Chinese
- 一十三萬一千八百二十一
- Chinese (financial)
- 壹拾參萬壹仟捌佰貳拾壹
Also seen as
UTF-8 encoding: F0 A0 8B AD (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.2.237.
- Address
- 0.2.2.237
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.2.237
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 131,821 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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.