1604504613 has 4 divisors (see below), whose sum is σ = 2139339488. Its totient is φ = 1069669740.

The previous prime is 1604504599. The next prime is 1604504641. The reversal of 1604504613 is 3164054061.

1604504613 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1604504613 - 2⁹ = 1604504101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604504653) 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, 267417433 + ... + 267417438.

It is an arithmetic number, because the mean of its divisors is an integer number (534834872).

Almost surely, 2^1604504613 is an apocalyptic number.

It is an amenable number.

1604504613 is a deficient number, since it is larger than the sum of its proper divisors (534834875).

1604504613 is an equidigital number, since it uses as much as digits as its factorization.

1604504613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534834874.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1604504613 is about 40056.2680862808. The cubic root of 1604504613 is about 1170.7036975026.

Adding to 1604504613 its reverse (3164054061), we get a palindrome (4768558674).

The spelling of 1604504613 in words is "one billion, six hundred four million, five hundred four thousand, six hundred thirteen".