1689045605 has 32 divisors (see below), whose sum is σ = 2234705760. Its totient is φ = 1217848320.

The previous prime is 1689045599. The next prime is 1689045607. The reversal of 1689045605 is 5065409861.

It is a Cunningham number, because it is equal to 41098²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 1 + 1689045604 = 1^2 + 41098^2 .

It is not a de Polignac number, because 1689045605 - 2⁸ = 1689045349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689045607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 787835 + ... + 789975.

It is an arithmetic number, because the mean of its divisors is an integer number (69834555).

Almost surely, 2^1689045605 is an apocalyptic number.

It is an amenable number.

1689045605 is a deficient number, since it is larger than the sum of its proper divisors (545660155).

1689045605 is a wasteful number, since it uses less digits than its factorization.

1689045605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 1689045605 is about 41098.0000121660. Note that the first 4 decimals coincide. The cubic root of 1689045605 is about 1190.9141588014.

The spelling of 1689045605 in words is "one billion, six hundred eighty-nine million, forty-five thousand, six hundred five".