number.wiki
Number

1,381

1,381 is a prime, odd, a calendar year.

Deficient Number Prime Squarefree Year

Properties

Parity
Odd
Digit count
4
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
1,382

Primality

1,381 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 1381
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 1,381)
1 × 1381
First multiples
1,381 · 2,762 · 4,143 · 5,524 · 6,905 · 8,286 · 9,667 · 11,048 · 12,429 · 13,810

Representations

In words
one thousand three hundred eighty-one
Ordinal
1381st
Roman numeral
MCCCLXXXI
Binary
10101100101
Octal
2545
Hexadecimal
565

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 1,373 (gap of 8)
  • Next prime: 1,399 (gap of 18)
Unicode codepoint
ե
U+0565
Lowercase letter (Ll)

UTF-8 encoding: D5 A5 (2 bytes).

Lookup U+0565 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000565
RGB(0, 5, 101)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.101.