217385325 has 18 divisors (see below), whose sum is σ = 389361674. Its totient is φ = 115938720.

The previous prime is 217385309. The next prime is 217385347. The reversal of 217385325 is 523583712.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13638249 + 203747076 = 3693^2 + 14274^2 .

It is not a de Polignac number, because 217385325 - 2⁴ = 217385309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217385325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 482854 + ... + 483303.

Almost surely, 2^217385325 is an apocalyptic number.

217385325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217385325 is a deficient number, since it is larger than the sum of its proper divisors (171976349).

217385325 is a wasteful number, since it uses less digits than its factorization.

217385325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966173 (or 966165 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 217385325 is about 14743.9928445452. The cubic root of 217385325 is about 601.2799758281.

The spelling of 217385325 in words is "two hundred seventeen million, three hundred eighty-five thousand, three hundred twenty-five".