689032121 has 2 divisors, whose sum is σ = 689032122. Its totient is φ = 689032120.

The previous prime is 689032111. The next prime is 689032159. The reversal of 689032121 is 121230986.

689032121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685863721 + 3168400 = 26189^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689032121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689032111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344516060 + 344516061.

It is an arithmetic number, because the mean of its divisors is an integer number (344516061).

Almost surely, 2^689032121 is an apocalyptic number.

It is an amenable number.

689032121 is a deficient number, since it is larger than the sum of its proper divisors (1).

689032121 is an equidigital number, since it uses as much as digits as its factorization.

689032121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 689032121 is about 26249.4213460030. The cubic root of 689032121 is about 883.2422241698.

The spelling of 689032121 in words is "six hundred eighty-nine million, thirty-two thousand, one hundred twenty-one".