136205561 has 2 divisors, whose sum is σ = 136205562. Its totient is φ = 136205560.

The previous prime is 136205533. The next prime is 136205611. The reversal of 136205561 is 165502631.

136205561 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., 136165561 + 40000 = 11669^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 136205561 - 2²⁶ = 69096697 is a prime.

It is not a weakly prime, because it can be changed into another prime (136205521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68102780 + 68102781.

It is an arithmetic number, because the mean of its divisors is an integer number (68102781).

Almost surely, 2^136205561 is an apocalyptic number.

It is an amenable number.

136205561 is a deficient number, since it is larger than the sum of its proper divisors (1).

136205561 is an equidigital number, since it uses as much as digits as its factorization.

136205561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 136205561 is about 11670.7138170722. The cubic root of 136205561 is about 514.5152833957.

The spelling of 136205561 in words is "one hundred thirty-six million, two hundred five thousand, five hundred sixty-one".