135866161 has 2 divisors, whose sum is σ = 135866162. Its totient is φ = 135866160.

The previous prime is 135866153. The next prime is 135866173. The reversal of 135866161 is 161668531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130667761 + 5198400 = 11431^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 135866161 - 2³ = 135866153 is a prime.

It is a super-2 number, since 2×135866161² = 36919227409755842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135866161.

It is not a weakly prime, because it can be changed into another prime (135866461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67933080 + 67933081.

It is an arithmetic number, because the mean of its divisors is an integer number (67933081).

Almost surely, 2^135866161 is an apocalyptic number.

It is an amenable number.

135866161 is a deficient number, since it is larger than the sum of its proper divisors (1).

135866161 is an equidigital number, since it uses as much as digits as its factorization.

135866161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 135866161 is about 11656.1640774313. The cubic root of 135866161 is about 514.0875677844.

The spelling of 135866161 in words is "one hundred thirty-five million, eight hundred sixty-six thousand, one hundred sixty-one".