9781625 has 24 divisors (see below), whose sum is σ = 14209416. Its totient is φ = 6703200.

The previous prime is 9781609. The next prime is 9781631. The reversal of 9781625 is 5261879.

It can be written as a sum of positive squares in 4 ways, for example, as 1301881 + 8479744 = 1141^2 + 2912^2 .

It is not a de Polignac number, because 9781625 - 2⁴ = 9781609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5327 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (592059).

Almost surely, 2^9781625 is an apocalyptic number.

It is an amenable number.

9781625 is a deficient number, since it is larger than the sum of its proper divisors (4427791).

9781625 is a wasteful number, since it uses less digits than its factorization.

9781625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1609 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 9781625 is about 3127.5589522821. The cubic root of 9781625 is about 213.8636639980.

The spelling of 9781625 in words is "nine million, seven hundred eighty-one thousand, six hundred twenty-five".