Number
18,121
18,121 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 16
- Digital root
- 4
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 12,181
- Recamán's sequence
- a(15,602) = 18,121
- Square (n²)
- 328,370,641
- Cube (n³)
- 5,950,404,385,561
- Divisor count
- 2
- σ(n) — sum of divisors
- 18,122
- φ(n) — Euler's totient
- 18,120
Primality
18,121 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
18,121
·
36,242
(double)
·
54,363
·
72,484
·
90,605
·
108,726
·
126,847
·
144,968
·
163,089
·
181,210
Sums & aliquot sequence
As a sum of two squares:
61² + 120²
As consecutive integers:
9,060 + 9,061
Representations
- In words
- eighteen thousand one hundred twenty-one
- Ordinal
- 18121st
- Binary
- 100011011001001
- Octal
- 43311
- Hexadecimal
- 0x46C9
- Base64
- Rsk=
- One's complement
- 47,414 (16-bit)
In other bases
ternary (3)
220212011
quaternary (4)
10123021
quinary (5)
1034441
senary (6)
215521
septenary (7)
103555
nonary (9)
26764
undecimal (11)
12684
duodecimal (12)
a5a1
tridecimal (13)
832c
tetradecimal (14)
6865
pentadecimal (15)
5581
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιηρκαʹ
- Mayan (base 20)
- 𝋢·𝋥·𝋦·𝋡
- Chinese
- 一萬八千一百二十一
- Chinese (financial)
- 壹萬捌仟壹佰貳拾壹
In other modern scripts
Eastern Arabic
١٨١٢١
Devanagari
१८१२१
Bengali
১৮১২১
Tamil
௧௮௧௨௧
Thai
๑๘๑๒๑
Tibetan
༡༨༡༢༡
Khmer
១៨១២១
Lao
໑໘໑໒໑
Burmese
၁၈၁၂၁
Digit at this position in famous constants
- π — Pi (π)
- Digit 18,121 = 3
- e — Euler's number (e)
- Digit 18,121 = 7
- φ — Golden ratio (φ)
- Digit 18,121 = 2
- √2 — Pythagoras's (√2)
- Digit 18,121 = 5
- ln 2 — Natural log of 2
- Digit 18,121 = 5
- γ — Euler-Mascheroni (γ)
- Digit 18,121 = 9
Also seen as
Prime neighborhood
Unicode codepoint
䛉
CJK Unified Ideograph-46C9
U+46C9
Other letter (Lo)
UTF-8 encoding: E4 9B 89 (3 bytes).
Hex color
#0046C9
RGB(0, 70, 201)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.70.201.
- Address
- 0.0.70.201
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.70.201
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 18121 first appears in π at position 297,024 of the decimal expansion (the 297,024ordinal-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.