9771920918 has 4 divisors (see below), whose sum is σ = 14657881380. Its totient is φ = 4885960458.

The previous prime is 9771920911. The next prime is 9771920947. The reversal of 9771920918 is 8190291779.

9771920918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 9771920918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9771920911) 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 as a sum of consecutive naturals, namely, 2442980228 + ... + 2442980231.

It is an arithmetic number, because the mean of its divisors is an integer number (3664470345).

Almost surely, 2^9771920918 is an apocalyptic number.

9771920918 is a deficient number, since it is larger than the sum of its proper divisors (4885960462).

9771920918 is a wasteful number, since it uses less digits than its factorization.

9771920918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4885960461.

The product of its (nonzero) digits is 571536, while the sum is 53.

The square root of 9771920918 is about 98853.0268530003. The cubic root of 9771920918 is about 2137.9291783839.

The spelling of 9771920918 in words is "nine billion, seven hundred seventy-one million, nine hundred twenty thousand, nine hundred eighteen".