201661241 has 2 divisors, whose sum is σ = 201661242. Its totient is φ = 201661240.

The previous prime is 201661177. The next prime is 201661253. The reversal of 201661241 is 142166102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201498025 + 163216 = 14195^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 201661241 - 2⁶ = 201661177 is a prime.

It is a super-2 number, since 2×201661241² = 81334512243320162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201661441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100830620 + 100830621.

It is an arithmetic number, because the mean of its divisors is an integer number (100830621).

Almost surely, 2^201661241 is an apocalyptic number.

It is an amenable number.

201661241 is a deficient number, since it is larger than the sum of its proper divisors (1).

201661241 is an equidigital number, since it uses as much as digits as its factorization.

201661241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 201661241 is about 14200.7479028395. The cubic root of 201661241 is about 586.4182512247.

The spelling of 201661241 in words is "two hundred one million, six hundred sixty-one thousand, two hundred forty-one".