689371169 has 2 divisors, whose sum is σ = 689371170. Its totient is φ = 689371168.

The previous prime is 689371153. The next prime is 689371183. The reversal of 689371169 is 961173986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688537600 + 833569 = 26240^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 689371169 - 2⁴ = 689371153 is a prime.

It is a super-2 number, since 2×689371169² = 950465217296853122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (689371469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344685584 + 344685585.

It is an arithmetic number, because the mean of its divisors is an integer number (344685585).

Almost surely, 2^689371169 is an apocalyptic number.

It is an amenable number.

689371169 is a deficient number, since it is larger than the sum of its proper divisors (1).

689371169 is an equidigital number, since it uses as much as digits as its factorization.

689371169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 689371169 is about 26255.8787512435. The cubic root of 689371169 is about 883.3870710237.

The spelling of 689371169 in words is "six hundred eighty-nine million, three hundred seventy-one thousand, one hundred sixty-nine".