1604544013 has 4 divisors (see below), whose sum is σ = 1606664380. Its totient is φ = 1602423648.

The previous prime is 1604543989. The next prime is 1604544017. The reversal of 1604544013 is 3104454061.

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 571114404 + 1033429609 = 23898^2 + 32147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604544013 - 2¹⁷ = 1604412941 is a prime.

It is a super-2 number, since 2×1604544013² = 5149122979308288338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604544017) 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 3 ways as a sum of consecutive naturals, for example, 1059048 + ... + 1060561.

It is an arithmetic number, because the mean of its divisors is an integer number (401666095).

Almost surely, 2^1604544013 is an apocalyptic number.

It is an amenable number.

1604544013 is a deficient number, since it is larger than the sum of its proper divisors (2120367).

1604544013 is an equidigital number, since it uses as much as digits as its factorization.

1604544013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120366.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1604544013 is about 40056.7598914341. The cubic root of 1604544013 is about 1170.7132799718.

Adding to 1604544013 its reverse (3104454061), we get a palindrome (4708998074).

The spelling of 1604544013 in words is "one billion, six hundred four million, five hundred forty-four thousand, thirteen".