89 (number)

← 88 89 90 →
← 80 81 82 83 84 85 86 87 88 89 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	eighty-nine
Ordinal	89th (eighty-ninth)
Factorization	prime
Prime	24th
Divisors	1, 89
Roman numeral	LXXXIX
Binary	10110012
Ternary	100223
Quaternary	11214
Quinary	3245
Senary	2256
Octal	1318
Duodecimal	7512
Hexadecimal	5916
Vigesimal	4920
Base 36	2H36

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

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.

Eighty-nine is:

Eighty-nine is also:

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