131,561
131,561 is a prime, odd.
131,561 (one hundred thirty-one thousand five hundred sixty-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x201E9.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 17
- Digit product
- 90
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 165,131
- Recamán's sequence
- a(229,250) = 131,561
- Square (n²)
- 17,308,296,721
- Cube (n³)
- 2,277,096,824,911,481
- Divisor count
- 2
- σ(n) — sum of divisors
- 131,562
- φ(n) — Euler's totient
- 131,560
Primality
131,561 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√131,561 = [362; (1, 2, 2, 22, 4, 6, 1, 2, 1, 2, 10, 1, 3, 1, 8, 3, 1, 2, 5, 1, 17, 3, 2, 2, …)]
Representations
- In words
- one hundred thirty-one thousand five hundred sixty-one
- Ordinal
- 131561st
- Binary
- 100000000111101001
- Octal
- 400751
- Hexadecimal
- 0x201E9
- Base64
- AgHp
- One's complement
- 4,294,835,734 (32-bit)
- Scientific notation
- 1.31561 × 10⁵
- As a duration
- 131,561 s = 1 day, 12 hours, 32 minutes, 41 seconds
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλαφξαʹ
- Mayan (base 20)
- 𝋰·𝋨·𝋲·𝋡
- Chinese
- 一十三萬一千五百六十一
- Chinese (financial)
- 壹拾參萬壹仟伍佰陸拾壹
Also seen as
UTF-8 encoding: F0 A0 87 A9 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.1.233.
- Address
- 0.2.1.233
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.1.233
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 131,561 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
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.