Number

12,491

12,491 is a prime, odd.

12,491 (twelve thousand four hundred ninety-one) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x30CB.

Arithmetic Number Cousin Prime Cube-Free Deficient Number Emirp Happy Number Odious Number Pernicious Number Prime Recamán's Sequence Sexy Prime Squarefree

Interestingness

★ ★ ★ ★ ★

9 notable facts · grade A

12,479 12,480 12,481 12,482 12,483 12,484 12,485 12,486 12,487 12,488 12,489 12,490 12,491 12,492 12,493 12,494 12,495 12,496 12,497 12,498 12,499 12,500 12,501 12,502 12,503

less more

Properties

Parity: Odd
Digit count: 5
Digit sum: 17
Digit product: 72
Digital root: 8
Palindrome: No
Bit width: 14 bits
Reversed: 19,421
Recamán's sequence: a(21,802) = 12,491
Square (n²): 156,025,081
Cube (n³): 1,948,909,286,771
Divisor count: 2
σ(n) — sum of divisors: 12,492
φ(n) — Euler's totient: 12,490

Primality

12,491 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 12491

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 12,491)

1 × 12491

First multiples

12,491 · 24,982 (double) · 37,473 · 49,964 · 62,455 · 74,946 · 87,437 · 99,928 · 112,419 · 124,910

Sums & aliquot sequence

As consecutive integers: 6,245 + 6,246

Continued fraction of √n

√12,491 = [111; (1, 3, 4, 1, 1, 44, 6, 1, 1, 4, 3, 8, 1, 1, 1, 2, 2, 2, 4, 1, 3, 1, 1, 1, …)]

Representations

In words: twelve thousand four hundred ninety-one
Ordinal: 12491st
Binary: 11000011001011
Octal: 30313
Hexadecimal: 0x30CB
Base64: MMs=
One's complement: 53,044 (16-bit)
Scientific notation: 1.2491 × 10⁴
As a duration: 12,491 s = 3 hours, 28 minutes, 11 seconds

In other bases

ternary (3) 122010122

quaternary (4) 3003023

quinary (5) 344431

senary (6) 133455

septenary (7) 51263

nonary (9) 18118

undecimal (11) 9426

duodecimal (12) 728b

tridecimal (13) 58bb

tetradecimal (14) 47a3

pentadecimal (15) 3a7b

As an angle

12,491° = 34 × 360° + 251°

251° ≈ 4.381 rad

Compass bearing: WSW (west-southwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹
Egyptian hieroglyphic: 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵ιβυϟαʹ
Mayan (base 20): 𝋡·𝋫·𝋤·𝋫
Chinese: 一萬二千四百九十一
Chinese (financial): 壹萬貳仟肆佰玖拾壹

In other modern scripts

Eastern Arabic ١٢٤٩١ Devanagari १२४९१ Bengali ১২৪৯১ Tamil ௧௨௪௯௧ Thai ๑๒๔๙๑ Tibetan ༡༢༤༩༡ Khmer ១២៤៩១ Lao ໑໒໔໙໑ Burmese ၁၂၄၉၁

Digit at this position in famous constants

π — Pi (π): Digit 12,491 = 1
e — Euler's number (e): Digit 12,491 = 4
φ — Golden ratio (φ): Digit 12,491 = 7
√2 — Pythagoras's (√2): Digit 12,491 = 8
ln 2 — Natural log of 2: Digit 12,491 = 2
γ — Euler-Mascheroni (γ): Digit 12,491 = 9

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 12,487 (gap of 4)
Next prime: 12,497 (gap of 6)

Pair status: cousin with 12487, sexy with 12497.

Unicode codepoint

ニ

Katakana Letter Ni

U+30CB

Other letter (Lo)

UTF-8 encoding: E3 83 8B (3 bytes).

Lookup U+30CB on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0030CB

RGB(0, 48, 203)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.48.203.

Address: 0.0.48.203
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.48.203

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

Musical pitch

Heard as a frequency, 12,491 Hz is closest to:

Concert pitch (A4 = 440 Hz): G9 (12543.9 Hz, -7¢)
Scientific pitch (C4 = 256 Hz): G9 (12274.1 Hz, +30¢)
Baroque pitch (A4 = 415 Hz): G♯9 (12534.7 Hz, -6¢)

Position in π

The digit sequence 12491 first appears in π at position 7,516 of the decimal expansion (the 7,516ordinal-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 12491 on Pi Search ↗