165135225 has 24 divisors (see below), whose sum is σ = 275850400. Its totient is φ = 87160320.

The previous prime is 165135209. The next prime is 165135241. The reversal of 165135225 is 522531561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (165135209) and next prime (165135241).

It is not a de Polignac number, because 165135225 - 2⁴ = 165135209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165135192 and 165135201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4075 + ... + 18624.

Almost surely, 2^165135225 is an apocalyptic number.

165135225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165135225 is a deficient number, since it is larger than the sum of its proper divisors (110715175).

165135225 is a wasteful number, since it uses less digits than its factorization.

165135225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22809 (or 22804 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 165135225 is about 12850.4951266478. The cubic root of 165135225 is about 548.6304492723.

Adding to 165135225 its reverse (522531561), we get a palindrome (687666786).

The spelling of 165135225 in words is "one hundred sixty-five million, one hundred thirty-five thousand, two hundred twenty-five".