659401909 has 2 divisors, whose sum is σ = 659401910. Its totient is φ = 659401908.

The previous prime is 659401889. The next prime is 659401937. The reversal of 659401909 is 909104956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506385009 + 153016900 = 22503^2 + 12370^2 .

It is a cyclic number.

It is not a de Polignac number, because 659401909 - 2⁷ = 659401781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659401969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329700954 + 329700955.

It is an arithmetic number, because the mean of its divisors is an integer number (329700955).

Almost surely, 2^659401909 is an apocalyptic number.

It is an amenable number.

659401909 is a deficient number, since it is larger than the sum of its proper divisors (1).

659401909 is an equidigital number, since it uses as much as digits as its factorization.

659401909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 659401909 is about 25678.8221887220. The cubic root of 659401909 is about 870.3956930825.

The spelling of 659401909 in words is "six hundred fifty-nine million, four hundred one thousand, nine hundred nine".