← 88 89 90 →
Cardinaleighty-nine
Ordinal89th
(eighty-ninth)
Factorizationprime
Prime24th
Divisors1, 89
Greek numeralΠΘ´
Roman numeralLXXXIX
Binary10110012
Ternary100223
Octal1318
Duodecimal7512
Hexadecimal5916

89 (eighty-nine) is the natural number following 88 and preceding 90.

In mathematics

89 is:

M89 is the 10th Mersenne prime.

Although 89 is not a Lychrel number in base 10, it is unusual that it takes 24 iterations of the reverse and add process to reach a palindrome. Among the known non-Lychrel numbers in the first 10000 integers, no other number requires that many or more iterations. The palindrome reached is also unusually large.[4]

In science

Eighty-nine is:

In astronomy

In sports

In other fields

TI-89
Diaethria clymena eyespots

Eighty-nine is also:

See also

References

  1. ^ "Sloane's A109611 : Chen primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  2. ^ "Sloane's A002144 : Pythagorean primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  3. ^ "Sloane's A005478 : Prime Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  4. ^ Weisstein, Eric W. "196-Algorithm." From MathWorld, a Wolfram Web Resource. http://mathworld.wolfram.com/196-Algorithm.html
  5. ^ "NASA/IPAC Extragalactic Database". Results for NGC 4552. Retrieved 2006-10-24.
  6. ^ "Interstate 89". Interstate Guide. Retrieved December 3, 2018.
  7. ^ http://www.informationisbeautiful.net/2010/what-does-china-censor-online/ retrieved 28 May 2015