9720187801 has 16 divisors (see below), whose sum is σ = 10494038160. Its totient is φ = 8969748480.

The previous prime is 9720187747. The next prime is 9720187831. The reversal of 9720187801 is 1087810279.

It is a happy number.

9720187801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1544411401 + 8175776400 = 39299^2 + 90420^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720187801 - 2⁹ = 9720187289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720187831) 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 in 15 ways as a sum of consecutive naturals, for example, 313945 + ... + 343513.

It is an arithmetic number, because the mean of its divisors is an integer number (655877385).

Almost surely, 2^9720187801 is an apocalyptic number.

It is an amenable number.

9720187801 is a deficient number, since it is larger than the sum of its proper divisors (773850359).

9720187801 is a wasteful number, since it uses less digits than its factorization.

9720187801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29964.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 9720187801 is about 98591.0127800704. The cubic root of 9720187801 is about 2134.1497272170.

The spelling of 9720187801 in words is "nine billion, seven hundred twenty million, one hundred eighty-seven thousand, eight hundred one".