717729989 has 2 divisors, whose sum is σ = 717729990. Its totient is φ = 717729988.

The previous prime is 717729977. The next prime is 717730043. The reversal of 717729989 is 989927717.

717729989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717436225 + 293764 = 26785^2 + 542^2 .

It is an emirp because it is prime and its reverse (989927717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 717729989 - 2²⁸ = 449294533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717729689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358864994 + 358864995.

It is an arithmetic number, because the mean of its divisors is an integer number (358864995).

Almost surely, 2^717729989 is an apocalyptic number.

It is an amenable number.

717729989 is a deficient number, since it is larger than the sum of its proper divisors (1).

717729989 is an equidigital number, since it uses as much as digits as its factorization.

717729989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 59.

The square root of 717729989 is about 26790.4831796666. The cubic root of 717729989 is about 895.3380282201.

The spelling of 717729989 in words is "seven hundred seventeen million, seven hundred twenty-nine thousand, nine hundred eighty-nine".