1606436609 has 2 divisors, whose sum is σ = 1606436610. Its totient is φ = 1606436608.

The previous prime is 1606436597. The next prime is 1606436669. The reversal of 1606436609 is 9066346061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399882225 + 206554384 = 37415^2 + 14372^2 .

It is an emirp because it is prime and its reverse (9066346061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1606436609 - 2⁴ = 1606436593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1606436669) 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, 803218304 + 803218305.

It is an arithmetic number, because the mean of its divisors is an integer number (803218305).

Almost surely, 2^1606436609 is an apocalyptic number.

It is an amenable number.

1606436609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606436609 is an equidigital number, since it uses as much as digits as its factorization.

1606436609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 1606436609 is about 40080.3768570107. The cubic root of 1606436609 is about 1171.1733933898.

The spelling of 1606436609 in words is "one billion, six hundred six million, four hundred thirty-six thousand, six hundred nine".