9869121 has 30 divisors (see below), whose sum is σ = 15322230. Its totient is φ = 6329664.

The previous prime is 9869117. The next prime is 9869137. The reversal of 9869121 is 1219689.

It can be written as a sum of positive squares in 3 ways, for example, as 3920400 + 5948721 = 1980^2 + 2439^2 .

It is not a de Polignac number, because 9869121 - 2² = 9869117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9869221) by changing a digit.

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 29 ways as a sum of consecutive naturals, for example, 110845 + ... + 110933.

It is an arithmetic number, because the mean of its divisors is an integer number (510741).

Almost surely, 2^9869121 is an apocalyptic number.

It is an amenable number.

9869121 is a deficient number, since it is larger than the sum of its proper divisors (5453109).

9869121 is an equidigital number, since it uses as much as digits as its factorization.

9869121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 129 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 9869121 is about 3141.5157169748. The cubic root of 9869121 is about 214.4994376238.

The spelling of 9869121 in words is "nine million, eight hundred sixty-nine thousand, one hundred twenty-one".