9720187289 has 2 divisors, whose sum is σ = 9720187290. Its totient is φ = 9720187288.

The previous prime is 9720187261. The next prime is 9720187327. The reversal of 9720187289 is 9827810279.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9521856400 + 198330889 = 97580^2 + 14083^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720187289 - 2⁸ = 9720187033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9720187289.

It is not a weakly prime, because it can be changed into another prime (9720187229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860093644 + 4860093645.

It is an arithmetic number, because the mean of its divisors is an integer number (4860093645).

Almost surely, 2^9720187289 is an apocalyptic number.

It is an amenable number.

9720187289 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720187289 is an equidigital number, since it uses as much as digits as its factorization.

9720187289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 9720187289 is about 98591.0101834848. The cubic root of 9720187289 is about 2134.1496897457.

The spelling of 9720187289 in words is "nine billion, seven hundred twenty million, one hundred eighty-seven thousand, two hundred eighty-nine".