1604312513 has 4 divisors (see below), whose sum is σ = 1608936240. Its totient is φ = 1599688788.

The previous prime is 1604312497. The next prime is 1604312543. The reversal of 1604312513 is 3152134061.

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 a cyclic number.

It is not a de Polignac number, because 1604312513 - 2⁴ = 1604312497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604312543) 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, 2311343 + ... + 2312036.

It is an arithmetic number, because the mean of its divisors is an integer number (402234060).

Almost surely, 2^1604312513 is an apocalyptic number.

It is an amenable number.

1604312513 is a deficient number, since it is larger than the sum of its proper divisors (4623727).

1604312513 is an equidigital number, since it uses as much as digits as its factorization.

1604312513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623726.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1604312513 is about 40053.8701376034. The cubic root of 1604312513 is about 1170.6569746379.

Adding to 1604312513 its reverse (3152134061), we get a palindrome (4756446574).

The spelling of 1604312513 in words is "one billion, six hundred four million, three hundred twelve thousand, five hundred thirteen".