201825217 has 18 divisors (see below), whose sum is σ = 225640086. Its totient is φ = 180385920.

The previous prime is 201825199. The next prime is 201825251. The reversal of 201825217 is 712528102.

It can be written as a sum of positive squares in 3 ways, for example, as 2337841 + 199487376 = 1529^2 + 14124^2 .

It is not a de Polignac number, because 201825217 - 2²³ = 193436609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201825287) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 644653 + ... + 644965.

Almost surely, 2^201825217 is an apocalyptic number.

It is an amenable number.

201825217 is a deficient number, since it is larger than the sum of its proper divisors (23814869).

201825217 is an equidigital number, since it uses as much as digits as its factorization.

201825217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 201825217 is about 14206.5202284022. The cubic root of 201825217 is about 586.5771521410.

The spelling of 201825217 in words is "two hundred one million, eight hundred twenty-five thousand, two hundred seventeen".