9720657319 has 2 divisors, whose sum is σ = 9720657320. Its totient is φ = 9720657318.

The previous prime is 9720657301. The next prime is 9720657347. The reversal of 9720657319 is 9137560279.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9720657319 is a prime.

It is a super-4 number, since 4×9720657319⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9720957319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860328659 + 4860328660.

It is an arithmetic number, because the mean of its divisors is an integer number (4860328660).

Almost surely, 2^9720657319 is an apocalyptic number.

9720657319 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720657319 is an equidigital number, since it uses as much as digits as its factorization.

9720657319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 714420, while the sum is 49.

The square root of 9720657319 is about 98593.3938912745. The cubic root of 9720657319 is about 2134.1840888843.

The spelling of 9720657319 in words is "nine billion, seven hundred twenty million, six hundred fifty-seven thousand, three hundred nineteen".