689259629 has 2 divisors, whose sum is σ = 689259630. Its totient is φ = 689259628.

The previous prime is 689259587. The next prime is 689259631. The reversal of 689259629 is 926952986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570493225 + 118766404 = 23885^2 + 10898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689259629 is a prime.

Together with 689259631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689259689) 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, 344629814 + 344629815.

It is an arithmetic number, because the mean of its divisors is an integer number (344629815).

Almost surely, 2^689259629 is an apocalyptic number.

It is an amenable number.

689259629 is a deficient number, since it is larger than the sum of its proper divisors (1).

689259629 is an equidigital number, since it uses as much as digits as its factorization.

689259629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 56.

The square root of 689259629 is about 26253.7545695849. The cubic root of 689259629 is about 883.3394245535.

The spelling of 689259629 in words is "six hundred eighty-nine million, two hundred fifty-nine thousand, six hundred twenty-nine".