9981125 has 64 divisors (see below), whose sum is σ = 16713216. Its totient is φ = 5760000.

The previous prime is 9981121. The next prime is 9981143. The reversal of 9981125 is 5211899.

It is not a de Polignac number, because 9981125 - 2² = 9981121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163595 + ... + 163655.

It is an arithmetic number, because the mean of its divisors is an integer number (261144).

Almost surely, 2^9981125 is an apocalyptic number.

It is an amenable number.

9981125 is a deficient number, since it is larger than the sum of its proper divisors (6732091).

9981125 is a wasteful number, since it uses less digits than its factorization.

9981125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 101 counting only the distinct ones).

The product of its digits is 6480, while the sum is 35.

The square root of 9981125 is about 3159.2918510324. The cubic root of 9981125 is about 215.3078337810.

The spelling of 9981125 in words is "nine million, nine hundred eighty-one thousand, one hundred twenty-five".