9721009601 has 2 divisors, whose sum is σ = 9721009602. Its totient is φ = 9721009600.

The previous prime is 9721009591. The next prime is 9721009621. The reversal of 9721009601 is 1069001279.

9721009601 is digitally balanced in base 3, 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., 8394957376 + 1326052225 = 91624^2 + 36415^2 .

It is a cyclic number.

It is not a de Polignac number, because 9721009601 - 2³⁰ = 8647267777 is a prime.

It is not a weakly prime, because it can be changed into another prime (9721009621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860504800 + 4860504801.

It is an arithmetic number, because the mean of its divisors is an integer number (4860504801).

Almost surely, 2^9721009601 is an apocalyptic number.

It is an amenable number.

9721009601 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721009601 is an equidigital number, since it uses as much as digits as its factorization.

9721009601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 9721009601 is about 98595.1804146633. The cubic root of 9721009601 is about 2134.2098699103.

The spelling of 9721009601 in words is "nine billion, seven hundred twenty-one million, nine thousand, six hundred one".