9915225 has 24 divisors (see below), whose sum is σ = 16626912. Its totient is φ = 5212800.

The previous prime is 9915209. The next prime is 9915229. The reversal of 9915225 is 5225199.

It is not a de Polignac number, because 9915225 - 2⁴ = 9915209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9915229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4570 + ... + 6380.

It is an arithmetic number, because the mean of its divisors is an integer number (692788).

Almost surely, 2^9915225 is an apocalyptic number.

It is an amenable number.

9915225 is a deficient number, since it is larger than the sum of its proper divisors (6711687).

9915225 is a wasteful number, since it uses less digits than its factorization.

9915225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897 (or 1892 counting only the distinct ones).

The product of its digits is 8100, while the sum is 33.

The square root of 9915225 is about 3148.8450263549. The cubic root of 9915225 is about 214.8329331303.

It can be divided in two parts, 991 and 5225, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 9915225 in words is "nine million, nine hundred fifteen thousand, two hundred twenty-five".