89681 has 2 divisors, whose sum is σ = 89682. Its totient is φ = 89680.

The previous prime is 89671. The next prime is 89689. The reversal of 89681 is 18698.

89681 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 9025 = 284^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 89681 - 2¹⁰ = 88657 is a prime.

It is a super-2 number, since 2×89681² = 16085363522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44840 + 44841.

It is an arithmetic number, because the mean of its divisors is an integer number (44841).

2⁸⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

89681 is a deficient number, since it is larger than the sum of its proper divisors (1).

89681 is an equidigital number, since it uses as much as digits as its factorization.

89681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 89681 is about 299.4678613808. The cubic root of 89681 is about 44.7610378190.

The spelling of 89681 in words is "eighty-nine thousand, six hundred eighty-one".