1604242309 has 2 divisors, whose sum is σ = 1604242310. Its totient is φ = 1604242308.

The previous prime is 1604242303. The next prime is 1604242313. The reversal of 1604242309 is 9032424061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971568900 + 632673409 = 31170^2 + 25153^2 .

It is an emirp because it is prime and its reverse (9032424061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604242309 - 2¹⁷ = 1604111237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604242303) 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 as a sum of consecutive naturals, namely, 802121154 + 802121155.

It is an arithmetic number, because the mean of its divisors is an integer number (802121155).

Almost surely, 2^1604242309 is an apocalyptic number.

It is an amenable number.

1604242309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604242309 is an equidigital number, since it uses as much as digits as its factorization.

1604242309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1604242309 is about 40052.9937582698. The cubic root of 1604242309 is about 1170.6398985798.

The spelling of 1604242309 in words is "one billion, six hundred four million, two hundred forty-two thousand, three hundred nine".