Number

31,481

31,481 is a prime, odd.

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

Properties

Parity: Odd
Digit count: 5
Digit sum: 17
Digit product: 96
Digital root: 8
Palindrome: No
Bit width: 15 bits
Reversed: 18,413
Recamán's sequence: a(311,422) = 31,481
Square (n²): 991,053,361
Cube (n³): 31,199,350,857,641
Divisor count: 2
σ(n) — sum of divisors: 31,482
φ(n) — Euler's totient: 31,480

Primality

31,481 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 31481

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 31,481)

1 × 31481

First multiples

31,481 · 62,962 (double) · 94,443 · 125,924 · 157,405 · 188,886 · 220,367 · 251,848 · 283,329 · 314,810

Sums & aliquot sequence

As a sum of two squares: 109² + 140²

As consecutive integers: 15,740 + 15,741

Representations

In words: thirty-one thousand four hundred eighty-one
Ordinal: 31481st
Binary: 111101011111001
Octal: 75371
Hexadecimal: 0x7AF9
Base64: evk=
One's complement: 34,054 (16-bit)

In other bases

ternary (3) 1121011222

quaternary (4) 13223321

quinary (5) 2001411

senary (6) 401425

septenary (7) 160532

nonary (9) 47158

undecimal (11) 2171a

duodecimal (12) 16275

tridecimal (13) 11438

tetradecimal (14) b689

pentadecimal (15) 94db

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵λαυπαʹ
Mayan (base 20): 𝋣·𝋲·𝋮·𝋡
Chinese: 三萬一千四百八十一
Chinese (financial): 參萬壹仟肆佰捌拾壹

In other modern scripts

Eastern Arabic ٣١٤٨١ Devanagari ३१४८१ Bengali ৩১৪৮১ Tamil ௩௧௪௮௧ Thai ๓๑๔๘๑ Tibetan ༣༡༤༨༡ Khmer ៣១៤៨១ Lao ໓໑໔໘໑ Burmese ၃၁၄၈၁

Digit at this position in famous constants

π — Pi (π): Digit 31,481 = 7
e — Euler's number (e): Digit 31,481 = 0
φ — Golden ratio (φ): Digit 31,481 = 8
√2 — Pythagoras's (√2): Digit 31,481 = 5
ln 2 — Natural log of 2: Digit 31,481 = 5
γ — Euler-Mascheroni (γ): Digit 31,481 = 0

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 31,477 (gap of 4)
Next prime: 31,489 (gap of 8)

Pair status: cousin with 31477.

Unicode codepoint

竹

CJK Unified Ideograph-7Af9

U+7AF9

Other letter (Lo)

UTF-8 encoding: E7 AB B9 (3 bytes).

Lookup U+7AF9 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#007AF9

RGB(0, 122, 249)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.122.249.

Address: 0.0.122.249
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.122.249

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

Position in π

The digit sequence 31481 first appears in π at position 68,952 of the decimal expansion (the 68,952ordinal-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 31481 on Pi Search ↗