12165225 has 24 divisors (see below), whose sum is σ = 21174240. Its totient is φ = 6145920.

The previous prime is 12165221. The next prime is 12165277. The reversal of 12165225 is 52256121.

It is a happy number.

It is not a de Polignac number, because 12165225 - 2² = 12165221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12165195 and 12165204.

It is not an unprimeable number, because it can be changed into a prime (12165221) 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 23 ways as a sum of consecutive naturals, for example, 2844 + ... + 5693.

It is an arithmetic number, because the mean of its divisors is an integer number (882260).

Almost surely, 2^12165225 is an apocalyptic number.

12165225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12165225 is a deficient number, since it is larger than the sum of its proper divisors (9009015).

12165225 is a wasteful number, since it uses less digits than its factorization.

12165225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8569 (or 8564 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 12165225 is about 3487.8682601268. The cubic root of 12165225 is about 229.9888148310.

It can be divided in two parts, 1216 and 5225, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 12165225 in words is "twelve million, one hundred sixty-five thousand, two hundred twenty-five".