Number

31,981

31,981 is a prime, odd.

Arithmetic Number Deficient Number Emirp Odious Number Pernicious Number Prime Pythagorean Prime Recamán's Sequence Squarefree

Properties

Parity: Odd
Digit count: 5
Digit sum: 22
Digit product: 216
Digital root: 4
Palindrome: No
Bit width: 15 bits
Reversed: 18,913
Recamán's sequence: a(13,373) = 31,981
Square (n²): 1,022,784,361
Cube (n³): 32,709,666,649,141
Divisor count: 2
σ(n) — sum of divisors: 31,982
φ(n) — Euler's totient: 31,980

Primality

31,981 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 31981

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 31,981)

1 × 31981

First multiples

31,981 · 63,962 (double) · 95,943 · 127,924 · 159,905 · 191,886 · 223,867 · 255,848 · 287,829 · 319,810

Sums & aliquot sequence

As a sum of two squares: 110² + 141²

As consecutive integers: 15,990 + 15,991

Representations

In words: thirty-one thousand nine hundred eighty-one
Ordinal: 31981st
Binary: 111110011101101
Octal: 76355
Hexadecimal: 0x7CED
Base64: fO0=
One's complement: 33,554 (16-bit)

In other bases

ternary (3) 1121212111

quaternary (4) 13303231

quinary (5) 2010411

senary (6) 404021

septenary (7) 162145

nonary (9) 47774

undecimal (11) 22034

duodecimal (12) 16611

tridecimal (13) 11731

tetradecimal (14) b925

pentadecimal (15) 9721

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒁹
Egyptian hieroglyphic: 𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵λαϡπαʹ
Mayan (base 20): 𝋣·𝋳·𝋳·𝋡
Chinese: 三萬一千九百八十一
Chinese (financial): 參萬壹仟玖佰捌拾壹

In other modern scripts

Eastern Arabic ٣١٩٨١ Devanagari ३१९८१ Bengali ৩১৯৮১ Tamil ௩௧௯௮௧ Thai ๓๑๙๘๑ Tibetan ༣༡༩༨༡ Khmer ៣១៩៨១ Lao ໓໑໙໘໑ Burmese ၃၁၉၈၁

Digit at this position in famous constants

π — Pi (π): Digit 31,981 = 6
e — Euler's number (e): Digit 31,981 = 2
φ — Golden ratio (φ): Digit 31,981 = 3
√2 — Pythagoras's (√2): Digit 31,981 = 2
ln 2 — Natural log of 2: Digit 31,981 = 9
γ — Euler-Mascheroni (γ): Digit 31,981 = 0

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 31,973 (gap of 8)
Next prime: 31,991 (gap of 10)

Unicode codepoint

糭

CJK Unified Ideograph-7Ced

U+7CED

Other letter (Lo)

UTF-8 encoding: E7 B3 AD (3 bytes).

Lookup U+7CED on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#007CED

RGB(0, 124, 237)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.124.237.

Address: 0.0.124.237
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.124.237

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

Position in π

The digit sequence 31981 first appears in π at position 154,342 of the decimal expansion (the 154,342ordinal-suffix:nd 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 31981 on Pi Search ↗