201550201 has 4 divisors (see below), whose sum is σ = 203814900. Its totient is φ = 199285504.

The previous prime is 201550199. The next prime is 201550207. The reversal of 201550201 is 102055102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123210000 + 78340201 = 11100^2 + 8851^2 .

It is a cyclic number.

It is not a de Polignac number, because 201550201 - 2¹ = 201550199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201550207) 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 3 ways as a sum of consecutive naturals, for example, 1132216 + ... + 1132393.

It is an arithmetic number, because the mean of its divisors is an integer number (50953725).

Almost surely, 2^201550201 is an apocalyptic number.

It is an amenable number.

201550201 is a deficient number, since it is larger than the sum of its proper divisors (2264699).

201550201 is an equidigital number, since it uses as much as digits as its factorization.

201550201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264698.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 201550201 is about 14196.8377112651. The cubic root of 201550201 is about 586.3105990098.

The spelling of 201550201 in words is "two hundred one million, five hundred fifty thousand, two hundred one".