89435809 has 2 divisors, whose sum is σ = 89435810. Its totient is φ = 89435808.

The previous prime is 89435807. The next prime is 89435849. The reversal of 89435809 is 90853498.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86545809 + 2890000 = 9303^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 89435809 - 2¹ = 89435807 is a prime.

Together with 89435807, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89435807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44717904 + 44717905.

It is an arithmetic number, because the mean of its divisors is an integer number (44717905).

Almost surely, 2^89435809 is an apocalyptic number.

It is an amenable number.

89435809 is a deficient number, since it is larger than the sum of its proper divisors (1).

89435809 is an equidigital number, since it uses as much as digits as its factorization.

89435809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 89435809 is about 9457.0507559175. The cubic root of 89435809 is about 447.2020783700.

The spelling of 89435809 in words is "eighty-nine million, four hundred thirty-five thousand, eight hundred nine".