Number

19,801

19,801 is a prime, odd.

Arithmetic Number Deficient Number Emirp Evil Number Flippable Prime Pythagorean Prime Squarefree

Properties

Parity: Odd
Digit count: 5
Digit sum: 19
Digit product: 0
Digital root: 1
Palindrome: No
Bit width: 15 bits
Reversed: 10,891
Flips to (rotate 180°): 10,861
Square (n²): 392,079,601
Cube (n³): 7,763,568,179,401
Divisor count: 2
σ(n) — sum of divisors: 19,802
φ(n) — Euler's totient: 19,800

Primality

19,801 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 19801

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 19,801)

1 × 19801

First multiples

19,801 · 39,602 (double) · 59,403 · 79,204 · 99,005 · 118,806 · 138,607 · 158,408 · 178,209 · 198,010

Sums & aliquot sequence

As a sum of two squares: 99² + 100²

As consecutive integers: 9,900 + 9,901

Representations

In words: nineteen thousand eight hundred one
Ordinal: 19801st
Binary: 100110101011001
Octal: 46531
Hexadecimal: 0x4D59
Base64: TVk=
One's complement: 45,734 (16-bit)

In other bases

ternary (3) 1000011101

quaternary (4) 10311121

quinary (5) 1113201

senary (6) 231401

septenary (7) 111505

nonary (9) 30141

undecimal (11) 13971

duodecimal (12) b561

tridecimal (13) 9022

tetradecimal (14) 7305

pentadecimal (15) 5d01

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋 𒁹
Egyptian hieroglyphic: 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺
Greek (Milesian): ͵ιθωαʹ
Mayan (base 20): 𝋢·𝋩·𝋪·𝋡
Chinese: 一萬九千八百零一
Chinese (financial): 壹萬玖仟捌佰零壹

In other modern scripts

Eastern Arabic ١٩٨٠١ Devanagari १९८०१ Bengali ১৯৮০১ Tamil ௧௯௮௦௧ Thai ๑๙๘๐๑ Tibetan ༡༩༨༠༡ Khmer ១៩៨០១ Lao ໑໙໘໐໑ Burmese ၁၉၈၀၁

Digit at this position in famous constants

π — Pi (π): Digit 19,801 = 6
e — Euler's number (e): Digit 19,801 = 4
φ — Golden ratio (φ): Digit 19,801 = 6
√2 — Pythagoras's (√2): Digit 19,801 = 3
ln 2 — Natural log of 2: Digit 19,801 = 3
γ — Euler-Mascheroni (γ): Digit 19,801 = 5

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 19,793 (gap of 8)
Next prime: 19,813 (gap of 12)

Unicode codepoint

䵙

CJK Unified Ideograph-4D59

U+4D59

Other letter (Lo)

UTF-8 encoding: E4 B5 99 (3 bytes).

Lookup U+4D59 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#004D59

RGB(0, 77, 89)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.77.89.

Address: 0.0.77.89
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.77.89

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

Position in π

The digit sequence 19801 first appears in π at position 124,110 of the decimal expansion (the 124,110ordinal-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 19801 on Pi Search ↗