1606505189 has 2 divisors, whose sum is σ = 1606505190. Its totient is φ = 1606505188.

The previous prime is 1606505179. The next prime is 1606505203. The reversal of 1606505189 is 9815056061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1430730625 + 175774564 = 37825^2 + 13258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606505189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606505179) 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 as a sum of consecutive naturals, namely, 803252594 + 803252595.

It is an arithmetic number, because the mean of its divisors is an integer number (803252595).

Almost surely, 2^1606505189 is an apocalyptic number.

It is an amenable number.

1606505189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606505189 is an equidigital number, since it uses as much as digits as its factorization.

1606505189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 1606505189 is about 40081.2323787580. The cubic root of 1606505189 is about 1171.1900592468.

The spelling of 1606505189 in words is "one billion, six hundred six million, five hundred five thousand, one hundred eighty-nine".