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Number

1,997

1,997 is a prime, odd, a calendar year.

Cousin Prime Deficient Number Prime Sexy Prime Squarefree Twin Prime Year

Properties

Parity
Odd
Digit count
4
Digit sum
26
Digital root
8
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
1,998

Primality

1,997 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 1997
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 1,997)
1 × 1997
First multiples
1,997 · 3,994 · 5,991 · 7,988 · 9,985 · 11,982 · 13,979 · 15,976 · 17,973 · 19,970

Representations

In words
one thousand nine hundred ninety-seven
Ordinal
1997th
Roman numeral
MCMXCVII
Binary
11111001101
Octal
3715
Hexadecimal
7CD

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 1,993 (gap of 4)
  • Next prime: 1,999 (gap of 2)

Pair status: twin with 1999, cousin with 1993.

Unicode codepoint
ߍ
U+07CD
Other letter (Lo)

UTF-8 encoding: DF 8D (2 bytes).

Lookup U+07CD on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#0007CD
RGB(0, 7, 205)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.205.