1604683609 has 2 divisors, whose sum is σ = 1604683610. Its totient is φ = 1604683608.

The previous prime is 1604683607. The next prime is 1604683621. The reversal of 1604683609 is 9063864061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1602801225 + 1882384 = 40035^2 + 1372^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604683609 - 2¹ = 1604683607 is a prime.

Together with 1604683607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1604683607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802341804 + 802341805.

It is an arithmetic number, because the mean of its divisors is an integer number (802341805).

Almost surely, 2^1604683609 is an apocalyptic number.

It is an amenable number.

1604683609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604683609 is an equidigital number, since it uses as much as digits as its factorization.

1604683609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 1604683609 is about 40058.5023309659. The cubic root of 1604683609 is about 1170.7472298356.

The spelling of 1604683609 in words is "one billion, six hundred four million, six hundred eighty-three thousand, six hundred nine".