138,521
138,521 is a composite number, odd.
138,521 (one hundred thirty-eight thousand five hundred twenty-one) is an odd 6-digit number. It is a composite number with 4 divisors, and factors as 71 × 1,951. Written other ways, in hexadecimal, 0x21D19.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 240
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 125,831
- Recamán's sequence
- a(491,785) = 138,521
- Square (n²)
- 19,188,067,441
- Cube (n³)
- 2,657,950,289,994,761
- Divisor count
- 4
- σ(n) — sum of divisors
- 140,544
- φ(n) — Euler's totient
- 136,500
- Sum of prime factors
- 2,022
Primality
Prime factorization: 71 × 1951
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,521 = [372; (5, 2, 3, 5, 1, 1, 1, 92, 2, 1, 1, 19, 1, 1, 13, 46, 2, 4, 2, 2, 15, 2, 3, 22, …)]
Representations
- In words
- one hundred thirty-eight thousand five hundred twenty-one
- Ordinal
- 138521st
- Binary
- 100001110100011001
- Octal
- 416431
- Hexadecimal
- 0x21D19
- Base64
- Ah0Z
- One's complement
- 4,294,828,774 (32-bit)
- Scientific notation
- 1.38521 × 10⁵
- As a duration
- 138,521 s = 1 day, 14 hours, 28 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρληφκαʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋦·𝋡
- Chinese
- 一十三萬八千五百二十一
- Chinese (financial)
- 壹拾參萬捌仟伍佰貳拾壹
Also seen as
UTF-8 encoding: F0 A1 B4 99 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.25.
- Address
- 0.2.29.25
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.25
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 138,521 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.