689135189 has 2 divisors, whose sum is σ = 689135190. Its totient is φ = 689135188.

The previous prime is 689135179. The next prime is 689135191. The reversal of 689135189 is 981531986.

It is a happy number.

689135189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640596100 + 48539089 = 25310^2 + 6967^2 .

It is a cyclic number.

It is not a de Polignac number, because 689135189 - 2²⁰ = 688086613 is a prime.

Together with 689135191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689135179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344567594 + 344567595.

It is an arithmetic number, because the mean of its divisors is an integer number (344567595).

Almost surely, 2^689135189 is an apocalyptic number.

It is an amenable number.

689135189 is a deficient number, since it is larger than the sum of its proper divisors (1).

689135189 is an equidigital number, since it uses as much as digits as its factorization.

689135189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The square root of 689135189 is about 26251.3845158689. The cubic root of 689135189 is about 883.2862615318.

The spelling of 689135189 in words is "six hundred eighty-nine million, one hundred thirty-five thousand, one hundred eighty-nine".