689244329 has 2 divisors, whose sum is σ = 689244330. Its totient is φ = 689244328.

The previous prime is 689244263. The next prime is 689244403. The reversal of 689244329 is 923442986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349690000 + 339554329 = 18700^2 + 18427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689244329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689244529) 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, 344622164 + 344622165.

It is an arithmetic number, because the mean of its divisors is an integer number (344622165).

Almost surely, 2^689244329 is an apocalyptic number.

It is an amenable number.

689244329 is a deficient number, since it is larger than the sum of its proper divisors (1).

689244329 is an equidigital number, since it uses as much as digits as its factorization.

689244329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 689244329 is about 26253.4631810738. The cubic root of 689244329 is about 883.3328884615.

The spelling of 689244329 in words is "six hundred eighty-nine million, two hundred forty-four thousand, three hundred twenty-nine".