101,990
101,990 is a composite number, even.
101,990 (one hundred one thousand nine hundred ninety) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2 × 5 × 7 × 31 × 47. Its proper divisors sum to 119,194, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x18E66.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 99,101
- Flips to (rotate 180°)
- 66,101
- Square (n²)
- 10,401,960,100
- Cube (n³)
- 1,060,895,910,599,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 221,184
- φ(n) — Euler's totient
- 33,120
- Sum of prime factors
- 92
Primality
Prime factorization: 2 × 5 × 7 × 31 × 47
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√101,990 = [319; (2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 638)]
Period length 12 — the block in parentheses repeats forever.
Representations
- In words
- one hundred one thousand nine hundred ninety
- Ordinal
- 101990th
- Binary
- 11000111001100110
- Octal
- 307146
- Hexadecimal
- 0x18E66
- Base64
- AY5m
- One's complement
- 4,294,865,305 (32-bit)
- Scientific notation
- 1.0199 × 10⁵
- As a duration
- 101,990 s = 1 day, 4 hours, 19 minutes, 50 seconds
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ραϡϟʹ
- Mayan (base 20)
- 𝋬·𝋮·𝋳·𝋪
- Chinese
- 一十萬一千九百九十
- Chinese (financial)
- 壹拾萬壹仟玖佰玖拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 101990, here are decompositions:
- 3 + 101987 = 101990
- 13 + 101977 = 101990
- 61 + 101929 = 101990
- 73 + 101917 = 101990
- 127 + 101863 = 101990
- 151 + 101839 = 101990
- 157 + 101833 = 101990
- 193 + 101797 = 101990
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.1.142.102.
- Address
- 0.1.142.102
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.142.102
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 101,990 and was likely granted around 1870.
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.