689470849 has 2 divisors, whose sum is σ = 689470850. Its totient is φ = 689470848.

The previous prime is 689470843. The next prime is 689470867. The reversal of 689470849 is 948074986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550230849 + 139240000 = 23457^2 + 11800^2 .

It is a cyclic number.

It is not a de Polignac number, because 689470849 - 2¹⁵ = 689438081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689470849.

It is not a weakly prime, because it can be changed into another prime (689470843) 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, 344735424 + 344735425.

It is an arithmetic number, because the mean of its divisors is an integer number (344735425).

Almost surely, 2^689470849 is an apocalyptic number.

It is an amenable number.

689470849 is a deficient number, since it is larger than the sum of its proper divisors (1).

689470849 is an equidigital number, since it uses as much as digits as its factorization.

689470849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 689470849 is about 26257.7769241800. The cubic root of 689470849 is about 883.4296469168.

The spelling of 689470849 in words is "six hundred eighty-nine million, four hundred seventy thousand, eight hundred forty-nine".