200081561 has 2 divisors, whose sum is σ = 200081562. Its totient is φ = 200081560.

The previous prime is 200081549. The next prime is 200081569. The reversal of 200081561 is 165180002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168091225 + 31990336 = 12965^2 + 5656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200081561 is a prime.

It is not a weakly prime, because it can be changed into another prime (200081569) 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 as a sum of consecutive naturals, namely, 100040780 + 100040781.

It is an arithmetic number, because the mean of its divisors is an integer number (100040781).

Almost surely, 2^200081561 is an apocalyptic number.

It is an amenable number.

200081561 is a deficient number, since it is larger than the sum of its proper divisors (1).

200081561 is an equidigital number, since it uses as much as digits as its factorization.

200081561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 200081561 is about 14145.0189466116. The cubic root of 200081561 is about 584.8830321091.

The spelling of 200081561 in words is "two hundred million, eighty-one thousand, five hundred sixty-one".