Number

19,961

19,961 is a prime, odd.

Arithmetic Number Chen Prime Deficient Number Evil Number Flippable Prime Pythagorean Prime Self Number Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 5
Digit sum: 26
Digit product: 486
Digital root: 8
Palindrome: No
Bit width: 15 bits
Reversed: 16,991
Flips to (rotate 180°): 19,661
Square (n²): 398,441,521
Cube (n³): 7,953,291,200,681
Divisor count: 2
σ(n) — sum of divisors: 19,962
φ(n) — Euler's totient: 19,960

Primality

19,961 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 19961

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 19,961)

1 × 19961

First multiples

19,961 · 39,922 (double) · 59,883 · 79,844 · 99,805 · 119,766 · 139,727 · 159,688 · 179,649 · 199,610

Sums & aliquot sequence

As a sum of two squares: 19² + 140²

As consecutive integers: 9,980 + 9,981

Representations

In words: nineteen thousand nine hundred sixty-one
Ordinal: 19961st
Binary: 100110111111001
Octal: 46771
Hexadecimal: 0x4DF9
Base64: Tfk=
One's complement: 45,574 (16-bit)

In other bases

ternary (3) 1000101022

quaternary (4) 10313321

quinary (5) 1114321

senary (6) 232225

septenary (7) 112124

nonary (9) 30338

undecimal (11) 13aa7

duodecimal (12) b675

tridecimal (13) 9116

tetradecimal (14) 73bb

pentadecimal (15) 5dab

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵ιθϡξαʹ
Mayan (base 20): 𝋢·𝋩·𝋲·𝋡
Chinese: 一萬九千九百六十一
Chinese (financial): 壹萬玖仟玖佰陸拾壹

In other modern scripts

Eastern Arabic ١٩٩٦١ Devanagari १९९६१ Bengali ১৯৯৬১ Tamil ௧௯௯௬௧ Thai ๑๙๙๖๑ Tibetan ༡༩༩༦༡ Khmer ១៩៩៦១ Lao ໑໙໙໖໑ Burmese ၁၉၉၆၁

Digit at this position in famous constants

π — Pi (π): Digit 19,961 = 3
e — Euler's number (e): Digit 19,961 = 9
φ — Golden ratio (φ): Digit 19,961 = 4
√2 — Pythagoras's (√2): Digit 19,961 = 4
ln 2 — Natural log of 2: Digit 19,961 = 4
γ — Euler-Mascheroni (γ): Digit 19,961 = 1

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 19,949 (gap of 12)
Next prime: 19,963 (gap of 2)

Pair status: twin with 19963.

Unicode codepoint

䷹

Hexagram For The Joyous Lake

U+4DF9

Other symbol (So)

UTF-8 encoding: E4 B7 B9 (3 bytes).

Lookup U+4DF9 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#004DF9

RGB(0, 77, 249)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.77.249.

Address: 0.0.77.249
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.77.249

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

Position in π

The digit sequence 19961 first appears in π at position 181,703 of the decimal expansion (the 181,703ordinal-suffix:rd 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 19961 on Pi Search ↗