1604512213 has 4 divisors (see below), whose sum is σ = 1604941920. Its totient is φ = 1604082508.

The previous prime is 1604512157. The next prime is 1604512237. The reversal of 1604512213 is 3122154061.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3122154061 = 13 ⋅240165697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604512213 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 (1604516213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209203 + ... + 216736.

It is an arithmetic number, because the mean of its divisors is an integer number (401235480).

Almost surely, 2^1604512213 is an apocalyptic number.

It is an amenable number.

1604512213 is a deficient number, since it is larger than the sum of its proper divisors (429707).

1604512213 is an equidigital number, since it uses as much as digits as its factorization.

1604512213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429706.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1604512213 is about 40056.3629527195. The cubic root of 1604512213 is about 1170.7055459099.

Adding to 1604512213 its reverse (3122154061), we get a palindrome (4726666274).

The spelling of 1604512213 in words is "one billion, six hundred four million, five hundred twelve thousand, two hundred thirteen".