161,720
161,720 is a composite number, even.
161,720 (one hundred sixty-one thousand seven hundred twenty) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2³ × 5 × 13 × 311. Its proper divisors sum to 231,400, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x277B8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 27,161
- Recamán's sequence
- a(198,716) = 161,720
- Square (n²)
- 26,153,358,400
- Cube (n³)
- 4,229,521,120,448,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 393,120
- φ(n) — Euler's totient
- 59,520
- Sum of prime factors
- 335
Primality
Prime factorization: 2 3 × 5 × 13 × 311
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√161,720 = [402; (6, 1, 13, 1, 3, 3, 1, 1, 2, 6, 3, 1, 7, 1, 2, 2, 2, 3, 2, 3, 2, 2, 2, 1, …)]
Period length 38 — the block in parentheses repeats forever.
Representations
- In words
- one hundred sixty-one thousand seven hundred twenty
- Ordinal
- 161720th
- Binary
- 100111011110111000
- Octal
- 473670
- Hexadecimal
- 0x277B8
- Base64
- Ane4
- One's complement
- 4,294,805,575 (32-bit)
- Scientific notation
- 1.6172 × 10⁵
- As a duration
- 161,720 s = 1 day, 20 hours, 55 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρξαψκʹ
- Chinese
- 一十六萬一千七百二十
- Chinese (financial)
- 壹拾陸萬壹仟柒佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 161720, here are decompositions:
- 3 + 161717 = 161720
- 37 + 161683 = 161720
- 61 + 161659 = 161720
- 79 + 161641 = 161720
- 109 + 161611 = 161720
- 151 + 161569 = 161720
- 157 + 161563 = 161720
- 193 + 161527 = 161720
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A7 9E B8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.119.184.
- Address
- 0.2.119.184
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.119.184
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 161,720 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 161720 first appears in π at position 727,739 of the decimal expansion (the 727,739ordinal-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°.