1604253617 has 4 divisors (see below), whose sum is σ = 1643381796. Its totient is φ = 1565125440.

The previous prime is 1604253587. The next prime is 1604253653. The reversal of 1604253617 is 7163524061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60078001 + 1544175616 = 7751^2 + 39296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604253617 - 2¹⁴ = 1604237233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604253667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19564028 + ... + 19564109.

It is an arithmetic number, because the mean of its divisors is an integer number (410845449).

Almost surely, 2^1604253617 is an apocalyptic number.

It is an amenable number.

1604253617 is a deficient number, since it is larger than the sum of its proper divisors (39128179).

1604253617 is an equidigital number, since it uses as much as digits as its factorization.

1604253617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39128178.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1604253617 is about 40053.1349210021. The cubic root of 1604253617 is about 1170.6426491129.

Adding to 1604253617 its reverse (7163524061), we get a palindrome (8767777678).

The spelling of 1604253617 in words is "one billion, six hundred four million, two hundred fifty-three thousand, six hundred seventeen".