161,000
161,000 is a composite number, even.
161,000 (one hundred sixty-one thousand) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2³ × 5³ × 7 × 23. Its proper divisors sum to 288,280, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x274E8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 8
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 161
- Flips to (rotate 180°)
- 191
- Recamán's sequence
- a(200,156) = 161,000
- Square (n²)
- 25,921,000,000
- Cube (n³)
- 4,173,281,000,000,000
- Divisor count
- 64
- σ(n) — sum of divisors
- 449,280
- φ(n) — Euler's totient
- 52,800
- Sum of prime factors
- 51
Primality
Prime factorization: 2 3 × 5 3 × 7 × 23
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√161,000 = [401; (4, 31, 1, 5, 1, 1, 1, 31, 2, 4, 2, 31, 1, 1, 1, 5, 1, 31, 4, 802)]
Period length 20 — the block in parentheses repeats forever.
Representations
- In words
- one hundred sixty-one thousand
- Ordinal
- 161000th
- Binary
- 100111010011101000
- Octal
- 472350
- Hexadecimal
- 0x274E8
- Base64
- AnTo
- One's complement
- 4,294,806,295 (32-bit)
- Scientific notation
- 1.61 × 10⁵
- As a duration
- 161,000 s = 1 day, 20 hours, 43 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓆼
- Greek (Milesian)
- ͵ρξα
- Chinese
- 一十六萬一千
- Chinese (financial)
- 壹拾陸萬壹仟
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 161000, here are decompositions:
- 3 + 160997 = 161000
- 19 + 160981 = 161000
- 31 + 160969 = 161000
- 67 + 160933 = 161000
- 97 + 160903 = 161000
- 139 + 160861 = 161000
- 193 + 160807 = 161000
- 211 + 160789 = 161000
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A7 93 A8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.116.232.
- Address
- 0.2.116.232
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.116.232
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 161,000 and was likely granted around 1874.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 161000 first appears in π at position 48,938 of the decimal expansion (the 48,938ordinal-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°.