1604513 has 2 divisors, whose sum is σ = 1604514. Its totient is φ = 1604512.

The previous prime is 1604509. The next prime is 1604521. The reversal of 1604513 is 3154061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937024 + 667489 = 968^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604513 - 2² = 1604509 is a prime.

It is not a weakly prime, because it can be changed into another prime (1604543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802256 + 802257.

It is an arithmetic number, because the mean of its divisors is an integer number (802257).

2^1604513 is an apocalyptic number.

It is an amenable number.

1604513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604513 is an equidigital number, since it uses as much as digits as its factorization.

1604513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1604513 is about 1266.6937277811. The cubic root of 1604513 is about 117.0705737317.

Adding to 1604513 its reverse (3154061), we get a palindrome (4758574).

The spelling of 1604513 in words is "one million, six hundred four thousand, five hundred thirteen".