201659221 has 2 divisors, whose sum is σ = 201659222. Its totient is φ = 201659220.

The previous prime is 201659209. The next prime is 201659231. The reversal of 201659221 is 122956102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196392196 + 5267025 = 14014^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 201659221 - 2⁵ = 201659189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201659221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201659231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100829610 + 100829611.

It is an arithmetic number, because the mean of its divisors is an integer number (100829611).

Almost surely, 2^201659221 is an apocalyptic number.

It is an amenable number.

201659221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201659221 is an equidigital number, since it uses as much as digits as its factorization.

201659221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 201659221 is about 14200.6767796468. The cubic root of 201659221 is about 586.4162932071.

The spelling of 201659221 in words is "two hundred one million, six hundred fifty-nine thousand, two hundred twenty-one".