13,981
13,981 is a composite number, odd.
13,981 (thirteen thousand nine hundred eighty-one) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 11 × 31 × 41. Written other ways, in hexadecimal, 0x369D.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 22
- Digit product
- 216
- Digital root
- 4
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 18,931
- Recamán's sequence
- a(20,754) = 13,981
- Square (n²)
- 195,468,361
- Cube (n³)
- 2,732,843,155,141
- Divisor count
- 8
- σ(n) — sum of divisors
- 16,128
- φ(n) — Euler's totient
- 12,000
- Sum of prime factors
- 83
Primality
Prime factorization: 11 × 31 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√13,981 = [118; (4, 6, 1, 10, 1, 25, 2, 1, 3, 2, 10, 1, 4, 1, 1, 2, 2, 1, 2, 9, 11, 6, 2, 11, …)]
Representations
- In words
- thirteen thousand nine hundred eighty-one
- Ordinal
- 13981st
- Binary
- 11011010011101
- Octal
- 33235
- Hexadecimal
- 0x369D
- Base64
- Np0=
- One's complement
- 51,554 (16-bit)
- Scientific notation
- 1.3981 × 10⁴
- As a duration
- 13,981 s = 3 hours, 53 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιγϡπαʹ
- Mayan (base 20)
- 𝋡·𝋮·𝋳·𝋡
- Chinese
- 一萬三千九百八十一
- Chinese (financial)
- 壹萬參仟玖佰捌拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,981 = 9
- e — Euler's number (e)
- Digit 13,981 = 3
- φ — Golden ratio (φ)
- Digit 13,981 = 8
- √2 — Pythagoras's (√2)
- Digit 13,981 = 1
- ln 2 — Natural log of 2
- Digit 13,981 = 2
- γ — Euler-Mascheroni (γ)
- Digit 13,981 = 0
Also seen as
UTF-8 encoding: E3 9A 9D (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.54.157.
- Address
- 0.0.54.157
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.54.157
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 13,981 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A9 (14080 Hz, -12¢)
- Scientific pitch (C4 = 256 Hz): A9 (13777.2 Hz, +25¢)
- Baroque pitch (A4 = 415 Hz): A♯9 (14069.7 Hz, -11¢)
The digit sequence 13981 first appears in π at position 52,119 of the decimal expansion (the 52,119ordinal-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.