89475809 has 2 divisors, whose sum is σ = 89475810. Its totient is φ = 89475808.

The previous prime is 89475803. The next prime is 89475821. The reversal of 89475809 is 90857498.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 20502784 = 8305^2 + 4528^2 .

It is a cyclic number.

It is not a de Polignac number, because 89475809 - 2¹² = 89471713 is a prime.

It is not a weakly prime, because it can be changed into another prime (89475803) 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, 44737904 + 44737905.

It is an arithmetic number, because the mean of its divisors is an integer number (44737905).

Almost surely, 2^89475809 is an apocalyptic number.

It is an amenable number.

89475809 is a deficient number, since it is larger than the sum of its proper divisors (1).

89475809 is an equidigital number, since it uses as much as digits as its factorization.

89475809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 89475809 is about 9459.1653437288. The cubic root of 89475809 is about 447.2687385337.

The spelling of 89475809 in words is "eighty-nine million, four hundred seventy-five thousand, eight hundred nine".