1205511061 has 2 divisors, whose sum is σ = 1205511062. Its totient is φ = 1205511060.

The previous prime is 1205511001. The next prime is 1205511071. The reversal of 1205511061 is 1601155021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995087025 + 210424036 = 31545^2 + 14506^2 .

It is an emirp because it is prime and its reverse (1601155021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205511061 - 2⁹ = 1205510549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205511001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602755530 + 602755531.

It is an arithmetic number, because the mean of its divisors is an integer number (602755531).

Almost surely, 2^1205511061 is an apocalyptic number.

It is an amenable number.

1205511061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205511061 is an equidigital number, since it uses as much as digits as its factorization.

1205511061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1205511061 is about 34720.4703453165. The cubic root of 1205511061 is about 1064.2828563399.

Adding to 1205511061 its reverse (1601155021), we get a palindrome (2806666082).

The spelling of 1205511061 in words is "one billion, two hundred five million, five hundred eleven thousand, sixty-one".