217323225 has 36 divisors (see below), whose sum is σ = 444860416. Its totient is φ = 99347040.

The previous prime is 217323203. The next prime is 217323241. The reversal of 217323225 is 522323712.

It is a happy number.

It is not a de Polignac number, because 217323225 - 2⁵ = 217323193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 67417 + ... + 70566.

Almost surely, 2^217323225 is an apocalyptic number.

217323225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217323225 is an abundant number, since it is smaller than the sum of its proper divisors (227537191).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217323225 is a wasteful number, since it uses less digits than its factorization.

217323225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138006 (or 137998 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 217323225 is about 14741.8867517018. The cubic root of 217323225 is about 601.2227149211. Note that the first 3 decimals are identical.

Adding to 217323225 its reverse (522323712), we get a palindrome (739646937).

The spelling of 217323225 in words is "two hundred seventeen million, three hundred twenty-three thousand, two hundred twenty-five".