Number
13,381
13,381 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 16
- Digit product
- 72
- Digital root
- 7
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 18,331
- Recamán's sequence
- a(47,513) = 13,381
- Square (n²)
- 179,051,161
- Cube (n³)
- 2,395,883,585,341
- Divisor count
- 2
- σ(n) — sum of divisors
- 13,382
- φ(n) — Euler's totient
- 13,380
Primality
13,381 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
Sums & aliquot sequence
As a sum of two squares:
66² + 95²
As consecutive integers:
6,690 + 6,691
Representations
- In words
- thirteen thousand three hundred eighty-one
- Ordinal
- 13381st
- Binary
- 11010001000101
- Octal
- 32105
- Hexadecimal
- 0x3445
- Base64
- NEU=
- One's complement
- 52,154 (16-bit)
In other bases
ternary (3)
200100121
quaternary (4)
3101011
quinary (5)
412011
senary (6)
141541
septenary (7)
54004
nonary (9)
20317
undecimal (11)
a065
duodecimal (12)
78b1
tridecimal (13)
6124
tetradecimal (14)
4c3b
pentadecimal (15)
3e71
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιγτπαʹ
- Mayan (base 20)
- 𝋡·𝋭·𝋩·𝋡
- Chinese
- 一萬三千三百八十一
- Chinese (financial)
- 壹萬參仟參佰捌拾壹
In other modern scripts
Eastern Arabic
١٣٣٨١
Devanagari
१३३८१
Bengali
১৩৩৮১
Tamil
௧௩௩௮௧
Thai
๑๓๓๘๑
Tibetan
༡༣༣༨༡
Khmer
១៣៣៨១
Lao
໑໓໓໘໑
Burmese
၁၃၃၈၁
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,381 = 4
- e — Euler's number (e)
- Digit 13,381 = 6
- φ — Golden ratio (φ)
- Digit 13,381 = 4
- √2 — Pythagoras's (√2)
- Digit 13,381 = 9
- ln 2 — Natural log of 2
- Digit 13,381 = 6
- γ — Euler-Mascheroni (γ)
- Digit 13,381 = 5
Also seen as
Unicode codepoint
㑅
CJK Unified Ideograph-3445
U+3445
Other letter (Lo)
UTF-8 encoding: E3 91 85 (3 bytes).
Hex color
#003445
RGB(0, 52, 69)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.52.69.
- Address
- 0.0.52.69
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.52.69
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 13381 first appears in π at position 146,642 of the decimal expansion (the 146,642ordinal-suffix:nd 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.