121,991
121,991 is a composite number, odd.
121,991 (one hundred twenty-one thousand nine hundred ninety-one) is an odd 6-digit number. It is a composite number with 4 divisors, and factors as 43 × 2,837. Written other ways, in hexadecimal, 0x1DC87.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 162
- Digital root
- 5
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 199,121
- Square (n²)
- 14,881,804,081
- Cube (n³)
- 1,815,446,161,645,271
- Divisor count
- 4
- σ(n) — sum of divisors
- 124,872
- φ(n) — Euler's totient
- 119,112
- Sum of prime factors
- 2,880
Primality
Prime factorization: 43 × 2837
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√121,991 = [349; (3, 1, 2, 12, 1, 4, 2, 4, 3, 40, 1, 3, 1, 1, 3, 1, 1, 1, 7, 27, 1, 4, 3, 2, …)]
Representations
- In words
- one hundred twenty-one thousand nine hundred ninety-one
- Ordinal
- 121991st
- Binary
- 11101110010000111
- Octal
- 356207
- Hexadecimal
- 0x1DC87
- Base64
- AdyH
- One's complement
- 4,294,845,304 (32-bit)
- Scientific notation
- 1.21991 × 10⁵
- As a duration
- 121,991 s = 1 day, 9 hours, 53 minutes, 11 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρκαϡϟαʹ
- Mayan (base 20)
- 𝋯·𝋤·𝋳·𝋫
- Chinese
- 一十二萬一千九百九十一
- Chinese (financial)
- 壹拾貳萬壹仟玖佰玖拾壹
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.1.220.135.
- Address
- 0.1.220.135
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.220.135
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 121,991 and was likely granted around 1871.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.