1605601609 has 8 divisors (see below), whose sum is σ = 1626744960. Its totient is φ = 1584478896.

The previous prime is 1605601607. The next prime is 1605601619. The reversal of 1605601609 is 9061065061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1605601609 - 2¹ = 1605601607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605601607) 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 in 7 ways as a sum of consecutive naturals, for example, 208974 + ... + 216520.

It is an arithmetic number, because the mean of its divisors is an integer number (203343120).

Almost surely, 2^1605601609 is an apocalyptic number.

It is an amenable number.

1605601609 is a deficient number, since it is larger than the sum of its proper divisors (21143351).

1605601609 is an equidigital number, since it uses as much as digits as its factorization.

1605601609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10319.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1605601609 is about 40069.9589343438. The cubic root of 1605601609 is about 1170.9704391691.

The spelling of 1605601609 in words is "one billion, six hundred five million, six hundred one thousand, six hundred nine".