1604002501 has 8 divisors (see below), whose sum is σ = 1628146520. Its totient is φ = 1579917312.

The previous prime is 1604002489. The next prime is 1604002531. The reversal of 1604002501 is 1052004061.

It is a Cunningham number, because it is equal to 40050²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1604002500 = 1^2 + 40050^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1604002501 - 2²⁷ = 1469784773 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 (1604002531) 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 7 ways as a sum of consecutive naturals, for example, 41851 + ... + 70423.

It is an arithmetic number, because the mean of its divisors is an integer number (203518315).

Almost surely, 2^1604002501 is an apocalyptic number.

It is an amenable number.

1604002501 is a deficient number, since it is larger than the sum of its proper divisors (24144019).

1604002501 is an equidigital number, since it uses as much as digits as its factorization.

1604002501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29415.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1604002501 is about 40050.0000124844. Note that the first 4 decimals coincide. The cubic root of 1604002501 is about 1170.5815651638.

Adding to 1604002501 its reverse (1052004061), we get a palindrome (2656006562).

The spelling of 1604002501 in words is "one billion, six hundred four million, two thousand, five hundred one".