201065561 has 2 divisors, whose sum is σ = 201065562. Its totient is φ = 201065560.

The previous prime is 201065551. The next prime is 201065573. The reversal of 201065561 is 165560102.

201065561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183087961 + 17977600 = 13531^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 201065561 - 2¹⁰ = 201064537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201065561.

It is not a weakly prime, because it can be changed into another prime (201065551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100532780 + 100532781.

It is an arithmetic number, because the mean of its divisors is an integer number (100532781).

Almost surely, 2^201065561 is an apocalyptic number.

It is an amenable number.

201065561 is a deficient number, since it is larger than the sum of its proper divisors (1).

201065561 is an equidigital number, since it uses as much as digits as its factorization.

201065561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 201065561 is about 14179.7588484431. The cubic root of 201065561 is about 585.8402817327.

The spelling of 201065561 in words is "two hundred one million, sixty-five thousand, five hundred sixty-one".