1689742589 has 2 divisors, whose sum is σ = 1689742590. Its totient is φ = 1689742588.

The previous prime is 1689742567. The next prime is 1689742643. The reversal of 1689742589 is 9852479861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973752025 + 715990564 = 31205^2 + 26758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689742589 - 2²⁴ = 1672965373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689742289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844871294 + 844871295.

It is an arithmetic number, because the mean of its divisors is an integer number (844871295).

Almost surely, 2^1689742589 is an apocalyptic number.

It is an amenable number.

1689742589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689742589 is an equidigital number, since it uses as much as digits as its factorization.

1689742589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The square root of 1689742589 is about 41106.4786742917. The cubic root of 1689742589 is about 1191.0779463598.

The spelling of 1689742589 in words is "one billion, six hundred eighty-nine million, seven hundred forty-two thousand, five hundred eighty-nine".