981,221
981,221 is a prime, odd.
981,221 (nine hundred eighty-one thousand two hundred twenty-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0xEF8E5.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 288
- Digital root
- 5
- Palindrome
- No
- Bit width
- 20 bits
- Reversed
- 122,189
- Recamán's sequence
- a(323,969) = 981,221
- Square (n²)
- 962,794,650,841
- Cube (n³)
- 944,714,330,092,856,861
- Divisor count
- 2
- σ(n) — sum of divisors
- 981,222
- φ(n) — Euler's totient
- 981,220
Primality
981,221 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√981,221 = [990; (1, 1, 3, 3, 2, 8, 1, 21, 2, 1, 2, 1, 2, 1, 9, 1, 4, 6, 4, 104, 33, 1, 1, 3, …)]
Representations
- In words
- nine hundred eighty-one thousand two hundred twenty-one
- Ordinal
- 981221st
- Binary
- 11101111100011100101
- Octal
- 3574345
- Hexadecimal
- 0xEF8E5
- Base64
- Dvjl
- One's complement
- 4,293,986,074 (32-bit)
- Scientific notation
- 9.81221 × 10⁵
- As a duration
- 981,221 s = 11 days, 8 hours, 33 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ϡπασκαʹ
- Chinese
- 九十八萬一千二百二十一
- Chinese (financial)
- 玖拾捌萬壹仟貳佰貳拾壹
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.14.248.229.
- Address
- 0.14.248.229
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.14.248.229
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 981,221 and was likely granted around 1910.
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.