89321809 has 2 divisors, whose sum is σ = 89321810. Its totient is φ = 89321808.

The previous prime is 89321797. The next prime is 89321839. The reversal of 89321809 is 90812398.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 11881809 = 8800^2 + 3447^2 .

It is a cyclic number.

It is not a de Polignac number, because 89321809 - 2⁵ = 89321777 is a prime.

It is not a weakly prime, because it can be changed into another prime (89321839) 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, 44660904 + 44660905.

It is an arithmetic number, because the mean of its divisors is an integer number (44660905).

Almost surely, 2^89321809 is an apocalyptic number.

It is an amenable number.

89321809 is a deficient number, since it is larger than the sum of its proper divisors (1).

89321809 is an equidigital number, since it uses as much as digits as its factorization.

89321809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 89321809 is about 9451.0215849928. The cubic root of 89321809 is about 447.0119877938.

The spelling of 89321809 in words is "eighty-nine million, three hundred twenty-one thousand, eight hundred nine".