689712329 has 2 divisors, whose sum is σ = 689712330. Its totient is φ = 689712328.

The previous prime is 689712323. The next prime is 689712347. The reversal of 689712329 is 923217986.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626350729 + 63361600 = 25027^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 689712329 - 2¹² = 689708233 is a prime.

It is not a weakly prime, because it can be changed into another prime (689712323) 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, 344856164 + 344856165.

It is an arithmetic number, because the mean of its divisors is an integer number (344856165).

Almost surely, 2^689712329 is an apocalyptic number.

It is an amenable number.

689712329 is a deficient number, since it is larger than the sum of its proper divisors (1).

689712329 is an equidigital number, since it uses as much as digits as its factorization.

689712329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 689712329 is about 26262.3747783783. The cubic root of 689712329 is about 883.5327722293.

The spelling of 689712329 in words is "six hundred eighty-nine million, seven hundred twelve thousand, three hundred twenty-nine".