1659361009 has 2 divisors, whose sum is σ = 1659361010. Its totient is φ = 1659361008.

The previous prime is 1659361001. The next prime is 1659361051. The reversal of 1659361009 is 9001639561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652178609 + 7182400 = 40647^2 + 2680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1659361009 - 2³ = 1659361001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1659361001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829680504 + 829680505.

It is an arithmetic number, because the mean of its divisors is an integer number (829680505).

Almost surely, 2^1659361009 is an apocalyptic number.

It is an amenable number.

1659361009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659361009 is an equidigital number, since it uses as much as digits as its factorization.

1659361009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 1659361009 is about 40735.2551115124. The cubic root of 1659361009 is about 1183.8962011151.

The spelling of 1659361009 in words is "one billion, six hundred fifty-nine million, three hundred sixty-one thousand, nine".