217825325 has 6 divisors (see below), whose sum is σ = 270103434. Its totient is φ = 174260240.

The previous prime is 217825319. The next prime is 217825343. The reversal of 217825325 is 523528712.

It can be written as a sum of positive squares in 3 ways, for example, as 31393609 + 186431716 = 5603^2 + 13654^2 .

It is not a de Polignac number, because 217825325 - 2¹² = 217821229 is a prime.

It is a super-2 number, since 2×217825325² = 94895744422711250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4356482 + ... + 4356531.

It is an arithmetic number, because the mean of its divisors is an integer number (45017239).

Almost surely, 2^217825325 is an apocalyptic number.

217825325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217825325 is a deficient number, since it is larger than the sum of its proper divisors (52278109).

217825325 is an equidigital number, since it uses as much as digits as its factorization.

217825325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713023 (or 8713018 counting only the distinct ones).

The product of its digits is 33600, while the sum is 35.

The square root of 217825325 is about 14758.9066329454. The cubic root of 217825325 is about 601.6853771478.

The spelling of 217825325 in words is "two hundred seventeen million, eight hundred twenty-five thousand, three hundred twenty-five".