1604041613 has 6 divisors (see below), whose sum is σ = 1703947626. Its totient is φ = 1509685952.

The previous prime is 1604041609. The next prime is 1604041619. The reversal of 1604041613 is 3161404061.

It can be written as a sum of positive squares in 3 ways, for example, as 838855369 + 765186244 = 28963^2 + 27662^2 .

It is not a de Polignac number, because 1604041613 - 2² = 1604041609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604041619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2774870 + ... + 2775447.

It is an arithmetic number, because the mean of its divisors is an integer number (283991271).

Almost surely, 2^1604041613 is an apocalyptic number.

It is an amenable number.

1604041613 is a deficient number, since it is larger than the sum of its proper divisors (99906013).

1604041613 is an equidigital number, since it uses as much as digits as its factorization.

1604041613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550351 (or 5550334 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1604041613 is about 40050.4882991456. The cubic root of 1604041613 is about 1170.5910795741.

Adding to 1604041613 its reverse (3161404061), we get a palindrome (4765445674).

The spelling of 1604041613 in words is "one billion, six hundred four million, forty-one thousand, six hundred thirteen".