689023169 has 2 divisors, whose sum is σ = 689023170. Its totient is φ = 689023168.

The previous prime is 689023157. The next prime is 689023199. The reversal of 689023169 is 961320986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641963569 + 47059600 = 25337^2 + 6860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689023169 is a prime.

It is a super-2 number, since 2×689023169² = 949505854837605122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (689023199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344511584 + 344511585.

It is an arithmetic number, because the mean of its divisors is an integer number (344511585).

Almost surely, 2^689023169 is an apocalyptic number.

It is an amenable number.

689023169 is a deficient number, since it is larger than the sum of its proper divisors (1).

689023169 is an equidigital number, since it uses as much as digits as its factorization.

689023169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 689023169 is about 26249.2508274046. The cubic root of 689023169 is about 883.2383990851.

The spelling of 689023169 in words is "six hundred eighty-nine million, twenty-three thousand, one hundred sixty-nine".