Number

7,121

7,121 is a prime, odd.

Arithmetic Number Chen Prime Deficient Number Emirp Evil Number Prime Pythagorean Prime Recamán's Sequence Sexy Prime Sophie Germain Prime Squarefree

Properties

Parity: Odd
Digit count: 4
Digit sum: 11
Digit product: 14
Digital root: 2
Palindrome: No
Bit width: 13 bits
Reversed: 1,217
Recamán's sequence: a(26,442) = 7,121
Square (n²): 50,708,641
Cube (n³): 361,096,232,561
Divisor count: 2
σ(n) — sum of divisors: 7,122
φ(n) — Euler's totient: 7,120

Primality

7,121 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 7121

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 7,121)

1 × 7121

First multiples

7,121 · 14,242 (double) · 21,363 · 28,484 · 35,605 · 42,726 · 49,847 · 56,968 · 64,089 · 71,210

Sums & aliquot sequence

As a sum of two squares: 55² + 64²

As consecutive integers: 3,560 + 3,561

Representations

In words: seven thousand one hundred twenty-one
Ordinal: 7121st
Binary: 1101111010001
Octal: 15721
Hexadecimal: 0x1BD1
Base64: G9E=
One's complement: 58,414 (16-bit)

In other bases

ternary (3) 100202202

quaternary (4) 1233101

quinary (5) 211441

senary (6) 52545

septenary (7) 26522

nonary (9) 10682

undecimal (11) 5394

duodecimal (12) 4155

tridecimal (13) 331a

tetradecimal (14) 2849

pentadecimal (15) 219b

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓏺
Greek (Milesian): ͵ζρκαʹ
Mayan (base 20): 𝋱·𝋰·𝋡
Chinese: 七千一百二十一
Chinese (financial): 柒仟壹佰貳拾壹

In other modern scripts

Eastern Arabic ٧١٢١ Devanagari ७१२१ Bengali ৭১২১ Tamil ௭௧௨௧ Thai ๗๑๒๑ Tibetan ༧༡༢༡ Khmer ៧១២១ Lao ໗໑໒໑ Burmese ၇၁၂၁

Digit at this position in famous constants

π — Pi (π): Digit 7,121 = 0
e — Euler's number (e): Digit 7,121 = 4
φ — Golden ratio (φ): Digit 7,121 = 4
√2 — Pythagoras's (√2): Digit 7,121 = 5
ln 2 — Natural log of 2: Digit 7,121 = 5
γ — Euler-Mascheroni (γ): Digit 7,121 = 3

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 7,109 (gap of 12)
Next prime: 7,127 (gap of 6)

Pair status: sexy with 7127.

Unicode codepoint

ᯑ

Batak Letter Da

U+1BD1

Other letter (Lo)

UTF-8 encoding: E1 AF 91 (3 bytes).

Lookup U+1BD1 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#001BD1

RGB(0, 27, 209)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.27.209.

Address: 0.0.27.209
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.27.209

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Position in π

The digit sequence 7121 first appears in π at position 11,940 of the decimal expansion (the 11,940ordinal-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.

Look up 7121 on Pi Search ↗