981,000
981,000 is a composite number, even.
981,000 (nine hundred eighty-one thousand) is an even 6-digit number. It is a composite number with 96 divisors, and factors as 2³ × 3² × 5³ × 109. Its proper divisors sum to 2,365,200, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0xEF808.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 20 bits
- Reversed
- 189
- Flips to (rotate 180°)
- 186
- Recamán's sequence
- a(324,411) = 981,000
- Square (n²)
- 962,361,000,000
- Cube (n³)
- 944,076,141,000,000,000
- Divisor count
- 96
- σ(n) — sum of divisors
- 3,346,200
- φ(n) — Euler's totient
- 259,200
- Sum of prime factors
- 136
Primality
Prime factorization: 2 3 × 3 2 × 5 3 × 109
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√981,000 = [990; (2, 4, 1, 78, 2, 2, 1, 1, 4, 79, 55, 79, 4, 1, 1, 2, 2, 78, 1, 4, 2, 1980)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- nine hundred eighty-one thousand
- Ordinal
- 981000th
- Binary
- 11101111100000001000
- Octal
- 3574010
- Hexadecimal
- 0xEF808
- Base64
- DvgI
- One's complement
- 4,293,986,295 (32-bit)
- Scientific notation
- 9.81 × 10⁵
- As a duration
- 981,000 s = 11 days, 8 hours, 30 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋 ·
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼
- Greek (Milesian)
- ͵ϡπα
- Chinese
- 九十八萬一千
- Chinese (financial)
- 玖拾捌萬壹仟
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 981000, here are decompositions:
- 37 + 980963 = 981000
- 43 + 980957 = 981000
- 79 + 980921 = 981000
- 89 + 980911 = 981000
- 101 + 980899 = 981000
- 103 + 980897 = 981000
- 107 + 980893 = 981000
- 113 + 980887 = 981000
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.14.248.8.
- Address
- 0.14.248.8
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.14.248.8
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 981,000 and was likely granted around 1910.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 981000 first appears in π at position 118,940 of the decimal expansion (the 118,940ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.