138,991
138,991 is a composite number, odd.
138,991 (one hundred thirty-eight thousand nine hundred ninety-one) is an odd 6-digit number. It is a composite number with 4 divisors, and factors as 131 × 1,061. Written other ways, in hexadecimal, 0x21EEF.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 31
- Digit product
- 1,944
- Digital root
- 4
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 199,831
- Recamán's sequence
- a(490,845) = 138,991
- Square (n²)
- 19,318,498,081
- Cube (n³)
- 2,685,097,366,776,271
- Divisor count
- 4
- σ(n) — sum of divisors
- 140,184
- φ(n) — Euler's totient
- 137,800
- Sum of prime factors
- 1,192
Primality
Prime factorization: 131 × 1061
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,991 = [372; (1, 4, 2, 2, 8, 1, 1, 2, 1, 3, 1, 2, 38, 1, 7, 1, 2, 3, 1, 1, 14, 18, 8, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand nine hundred ninety-one
- Ordinal
- 138991st
- Binary
- 100001111011101111
- Octal
- 417357
- Hexadecimal
- 0x21EEF
- Base64
- Ah7v
- One's complement
- 4,294,828,304 (32-bit)
- Scientific notation
- 1.38991 × 10⁵
- As a duration
- 138,991 s = 1 day, 14 hours, 36 minutes, 31 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρληϡϟαʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋩·𝋫
- Chinese
- 一十三萬八千九百九十一
- Chinese (financial)
- 壹拾參萬捌仟玖佰玖拾壹
Also seen as
UTF-8 encoding: F0 A1 BB AF (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.239.
- Address
- 0.2.30.239
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.239
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 138,991 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 138991 first appears in π at position 642,554 of the decimal expansion (the 642,554ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.