131,391
131,391 is a composite number, odd.
131,391 (one hundred thirty-one thousand three hundred ninety-one) is an odd 6-digit number. It is a composite number with 12 divisors, and factors as 3² × 13 × 1,123. Written other ways, in hexadecimal, 0x2013F.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 81
- Digital root
- 9
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 193,131
- Square (n²)
- 17,263,594,881
- Cube (n³)
- 2,268,280,995,009,471
- Divisor count
- 12
- σ(n) — sum of divisors
- 204,568
- φ(n) — Euler's totient
- 80,784
- Sum of prime factors
- 1,142
Primality
Prime factorization: 3 2 × 13 × 1123
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√131,391 = [362; (2, 11, 2, 1, 1, 2, 20, 3, 20, 2, 1, 1, 2, 11, 2, 724)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-one thousand three hundred ninety-one
- Ordinal
- 131391st
- Binary
- 100000000100111111
- Octal
- 400477
- Hexadecimal
- 0x2013F
- Base64
- AgE/
- One's complement
- 4,294,835,904 (32-bit)
- Scientific notation
- 1.31391 × 10⁵
- As a duration
- 131,391 s = 1 day, 12 hours, 29 minutes, 51 seconds
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλατϟαʹ
- Mayan (base 20)
- 𝋰·𝋨·𝋩·𝋫
- Chinese
- 一十三萬一千三百九十一
- Chinese (financial)
- 壹拾參萬壹仟參佰玖拾壹
Also seen as
UTF-8 encoding: F0 A0 84 BF (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.1.63.
- Address
- 0.2.1.63
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.1.63
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 131,391 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 131391 first appears in π at position 431,725 of the decimal expansion (the 431,725ordinal-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°.