1689199689 has 4 divisors (see below), whose sum is σ = 2252266256. Its totient is φ = 1126133124.

The previous prime is 1689199643. The next prime is 1689199717. The reversal of 1689199689 is 9869919861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1689199689 - 2⁸ = 1689199433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689199289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281533279 + ... + 281533284.

It is an arithmetic number, because the mean of its divisors is an integer number (563066564).

Almost surely, 2^1689199689 is an apocalyptic number.

It is an amenable number.

1689199689 is a deficient number, since it is larger than the sum of its proper divisors (563066567).

1689199689 is an equidigital number, since it uses as much as digits as its factorization.

1689199689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563066566.

The product of its digits is 15116544, while the sum is 66.

The square root of 1689199689 is about 41099.8745618524. The cubic root of 1689199689 is about 1190.9503716064.

The spelling of 1689199689 in words is "one billion, six hundred eighty-nine million, one hundred ninety-nine thousand, six hundred eighty-nine".