1604683889 has 2 divisors, whose sum is σ = 1604683890. Its totient is φ = 1604683888.

The previous prime is 1604683879. The next prime is 1604683897. The reversal of 1604683889 is 9883864061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1588819600 + 15864289 = 39860^2 + 3983^2 .

It is an emirp because it is prime and its reverse (9883864061) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604683889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1604683889.

It is not a weakly prime, because it can be changed into another prime (1604683879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802341944 + 802341945.

It is an arithmetic number, because the mean of its divisors is an integer number (802341945).

Almost surely, 2^1604683889 is an apocalyptic number.

It is an amenable number.

1604683889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604683889 is an equidigital number, since it uses as much as digits as its factorization.

1604683889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The square root of 1604683889 is about 40058.5058258543. The cubic root of 1604683889 is about 1170.7472979298.

The spelling of 1604683889 in words is "one billion, six hundred four million, six hundred eighty-three thousand, eight hundred eighty-nine".