991,091
991,091 is a prime, odd.
991,091 (nine hundred ninety-one thousand ninety-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0xF1F73.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 20 bits
- Reversed
- 190,199
- Flips to (rotate 180°)
- 160,166
- Square (n²)
- 982,261,370,281
- Cube (n³)
- 973,510,403,733,166,571
- Divisor count
- 2
- σ(n) — sum of divisors
- 991,092
- φ(n) — Euler's totient
- 991,090
Primality
991,091 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√991,091 = [995; (1, 1, 6, 1, 1, 6, 1, 1, 4, 1, 1, 48, 76, 1, 1, 3, 1, 2, 1, 2, 1, 15, 5, 10, …)]
Representations
- In words
- nine hundred ninety-one thousand ninety-one
- Ordinal
- 991091st
- Binary
- 11110001111101110011
- Octal
- 3617563
- Hexadecimal
- 0xF1F73
- Base64
- Dx9z
- One's complement
- 4,293,976,204 (32-bit)
- Scientific notation
- 9.91091 × 10⁵
- As a duration
- 991,091 s = 11 days, 11 hours, 18 minutes, 11 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ϡϟαϟαʹ
- Chinese
- 九十九萬一千零九十一
- Chinese (financial)
- 玖拾玖萬壹仟零玖拾壹
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.15.31.115.
- Address
- 0.15.31.115
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.15.31.115
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 991,091 and was likely granted around 1911.
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.