9781916925 has 48 divisors (see below), whose sum is σ = 17669583360. Its totient is φ = 4735608000.

The previous prime is 9781916887. The next prime is 9781916929. The reversal of 9781916925 is 5296191879.

9781916925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9781916925 - 2⁹ = 9781916413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781916929) 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 47 ways as a sum of consecutive naturals, for example, 561496 + ... + 578654.

It is an arithmetic number, because the mean of its divisors is an integer number (368116320).

Almost surely, 2^9781916925 is an apocalyptic number.

It is an amenable number.

9781916925 is a deficient number, since it is larger than the sum of its proper divisors (7887666435).

9781916925 is a wasteful number, since it uses less digits than its factorization.

9781916925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17874 (or 17869 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 57.

The square root of 9781916925 is about 98903.5738737484. The cubic root of 9781916925 is about 2138.6579150847.

The spelling of 9781916925 in words is "nine billion, seven hundred eighty-one million, nine hundred sixteen thousand, nine hundred twenty-five".