989105717 has 2 divisors, whose sum is σ = 989105718. Its totient is φ = 989105716.

The previous prime is 989105687. The next prime is 989105729. The reversal of 989105717 is 717501989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954130321 + 34975396 = 30889^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 989105717 - 2⁶ = 989105653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989105017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494552858 + 494552859.

It is an arithmetic number, because the mean of its divisors is an integer number (494552859).

Almost surely, 2^989105717 is an apocalyptic number.

It is an amenable number.

989105717 is a deficient number, since it is larger than the sum of its proper divisors (1).

989105717 is an equidigital number, since it uses as much as digits as its factorization.

989105717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 47.

The square root of 989105717 is about 31450.0511446325. The cubic root of 989105717 is about 996.3553046677.

The spelling of 989105717 in words is "nine hundred eighty-nine million, one hundred five thousand, seven hundred seventeen".