201110561081 has 2 divisors, whose sum is σ = 201110561082. Its totient is φ = 201110561080.

The previous prime is 201110561077. The next prime is 201110561129. The reversal of 201110561081 is 180165011102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151076029225 + 50034531856 = 388685^2 + 223684^2 .

It is a cyclic number.

It is not a de Polignac number, because 201110561081 - 2² = 201110561077 is a prime.

It is a super-2 number, since 2×201110561081² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201110561081.

It is not a weakly prime, because it can be changed into another prime (201110561681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555280540 + 100555280541.

It is an arithmetic number, because the mean of its divisors is an integer number (100555280541).

Almost surely, 2^201110561081 is an apocalyptic number.

It is an amenable number.

201110561081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201110561081 is an equidigital number, since it uses as much as digits as its factorization.

201110561081 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 26.

Adding to 201110561081 its reverse (180165011102), we get a palindrome (381275572183).

The spelling of 201110561081 in words is "two hundred one billion, one hundred ten million, five hundred sixty-one thousand, eighty-one".