7989315689 has 2 divisors, whose sum is σ = 7989315690. Its totient is φ = 7989315688.

The previous prime is 7989315667. The next prime is 7989315709. The reversal of 7989315689 is 9865139897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4327008400 + 3662307289 = 65780^2 + 60517^2 .

It is an emirp because it is prime and its reverse (9865139897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7989315689 - 2¹² = 7989311593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7989315289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994657844 + 3994657845.

It is an arithmetic number, because the mean of its divisors is an integer number (3994657845).

Almost surely, 2^7989315689 is an apocalyptic number.

It is an amenable number.

7989315689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7989315689 is an equidigital number, since it uses as much as digits as its factorization.

7989315689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 65.

The square root of 7989315689 is about 89382.9720304712. The cubic root of 7989315689 is about 1999.1092440858.

The spelling of 7989315689 in words is "seven billion, nine hundred eighty-nine million, three hundred fifteen thousand, six hundred eighty-nine".