Number
81,013
81,013 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 31,018
- Recamán's sequence
- a(272,346) = 81,013
- Square (n²)
- 6,563,106,169
- Cube (n³)
- 531,696,920,069,197
- Divisor count
- 2
- σ(n) — sum of divisors
- 81,014
- φ(n) — Euler's totient
- 81,012
Primality
81,013 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
81,013
·
162,026
(double)
·
243,039
·
324,052
·
405,065
·
486,078
·
567,091
·
648,104
·
729,117
·
810,130
Sums & aliquot sequence
As a sum of two squares:
183² + 218²
As consecutive integers:
40,506 + 40,507
Representations
- In words
- eighty-one thousand thirteen
- Ordinal
- 81013th
- Binary
- 10011110001110101
- Octal
- 236165
- Hexadecimal
- 0x13C75
- Base64
- ATx1
- One's complement
- 4,294,886,282 (32-bit)
In other bases
ternary (3)
11010010111
quaternary (4)
103301311
quinary (5)
10043023
senary (6)
1423021
septenary (7)
455122
nonary (9)
133114
undecimal (11)
55959
duodecimal (12)
3aa71
tridecimal (13)
2ab4a
tetradecimal (14)
21749
pentadecimal (15)
1900d
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹 𒌋𒌋𒌋 𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵παιγʹ
- Mayan (base 20)
- 𝋪·𝋢·𝋪·𝋭
- Chinese
- 八萬一千零一十三
- Chinese (financial)
- 捌萬壹仟零壹拾參
In other modern scripts
Eastern Arabic
٨١٠١٣
Devanagari
८१०१३
Bengali
৮১০১৩
Tamil
௮௧௦௧௩
Thai
๘๑๐๑๓
Tibetan
༨༡༠༡༣
Khmer
៨១០១៣
Lao
໘໑໐໑໓
Burmese
၈၁၀၁၃
Digit at this position in famous constants
- π — Pi (π)
- Digit 81,013 = 7
- e — Euler's number (e)
- Digit 81,013 = 8
- φ — Golden ratio (φ)
- Digit 81,013 = 1
- √2 — Pythagoras's (√2)
- Digit 81,013 = 9
- ln 2 — Natural log of 2
- Digit 81,013 = 8
- γ — Euler-Mascheroni (γ)
- Digit 81,013 = 6
Also seen as
Prime neighborhood
Unicode codepoint
Egyptian Hieroglyph-13C75
U+13C75
Other letter (Lo)
UTF-8 encoding: F0 93 B1 B5 (4 bytes).
Hex color
#013C75
RGB(1, 60, 117)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.1.60.117.
- Address
- 0.1.60.117
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.60.117
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 81013 first appears in π at position 27,752 of the decimal expansion (the 27,752ordinal-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.