Number

2,801

2,801 is a prime, odd.

Arithmetic Number Chen Prime Cousin Prime Deficient Number Odious Number Pernicious Number Prime Pythagorean Prime Recamán's Sequence Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 4
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 12 bits
Reversed: 1,082
Recamán's sequence: a(15,425) = 2,801
Square (n²): 7,845,601
Cube (n³): 21,975,528,401
Divisor count: 2
σ(n) — sum of divisors: 2,802
φ(n) — Euler's totient: 2,800

Primality

2,801 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 2801

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 2,801)

1 × 2801

First multiples

2,801 · 5,602 (double) · 8,403 · 11,204 · 14,005 · 16,806 · 19,607 · 22,408 · 25,209 · 28,010

Sums & aliquot sequence

As a sum of two squares: 20² + 49²

As consecutive integers: 1,400 + 1,401

Representations

In words: two thousand eight hundred one
Ordinal: 2801st
Roman numeral: MMDCCCI
Binary: 101011110001
Octal: 5361
Hexadecimal: 0xAF1
Base64: CvE=
One's complement: 62,734 (16-bit)

In other bases

ternary (3) 10211202

quaternary (4) 223301

quinary (5) 42201

senary (6) 20545

septenary (7) 11111

nonary (9) 3752

undecimal (11) 2117

duodecimal (12) 1755

tridecimal (13) 1376

tetradecimal (14) 1041

pentadecimal (15) c6b

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺
Greek (Milesian): ͵βωαʹ
Mayan (base 20): 𝋧·𝋠·𝋡
Chinese: 二千八百零一
Chinese (financial): 貳仟捌佰零壹

In other modern scripts

Eastern Arabic ٢٨٠١ Devanagari २८०१ Bengali ২৮০১ Tamil ௨௮௦௧ Thai ๒๘๐๑ Tibetan ༢༨༠༡ Khmer ២៨០១ Lao ໒໘໐໑ Burmese ၂၈၀၁

Digit at this position in famous constants

π — Pi (π): Digit 2,801 = 4
e — Euler's number (e): Digit 2,801 = 7
φ — Golden ratio (φ): Digit 2,801 = 9
√2 — Pythagoras's (√2): Digit 2,801 = 6
ln 2 — Natural log of 2: Digit 2,801 = 5
γ — Euler-Mascheroni (γ): Digit 2,801 = 9

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 2,797 (gap of 4)
Next prime: 2,803 (gap of 2)

Pair status: twin with 2803, cousin with 2797.

Unicode codepoint

૱

Gujarati Rupee Sign

U+0AF1

Currency symbol (Sc)

UTF-8 encoding: E0 AB B1 (3 bytes).

Lookup U+0AF1 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000AF1

RGB(0, 10, 241)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.10.241.

Address: 0.0.10.241
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.10.241

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

Position in π

The digit sequence 2801 first appears in π at position 3,416 of the decimal expansion (the 3,416ordinal-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 2801 on Pi Search ↗