215236225 has 6 divisors (see below), whose sum is σ = 266892950. Its totient is φ = 172188960.

The previous prime is 215236213. The next prime is 215236253. The reversal of 215236225 is 522632512.

It can be written as a sum of positive squares in 3 ways, for example, as 61575409 + 153660816 = 7847^2 + 12396^2 .

It is not a de Polignac number, because 215236225 - 2¹¹ = 215234177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215236193 and 215236202.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4304700 + ... + 4304749.

Almost surely, 2^215236225 is an apocalyptic number.

215236225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215236225 is a deficient number, since it is larger than the sum of its proper divisors (51656725).

215236225 is an equidigital number, since it uses as much as digits as its factorization.

215236225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8609459 (or 8609454 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 215236225 is about 14670.9312928662. The cubic root of 215236225 is about 599.2919657337.

Adding to 215236225 its reverse (522632512), we get a palindrome (737868737).

The spelling of 215236225 in words is "two hundred fifteen million, two hundred thirty-six thousand, two hundred twenty-five".