135420161 has 2 divisors, whose sum is σ = 135420162. Its totient is φ = 135420160.

The previous prime is 135420151. The next prime is 135420179. The reversal of 135420161 is 161024531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130667761 + 4752400 = 11431^2 + 2180^2 .

It is an emirp because it is prime and its reverse (161024531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135420161 is a prime.

It is not a weakly prime, because it can be changed into another prime (135420101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710080 + 67710081.

It is an arithmetic number, because the mean of its divisors is an integer number (67710081).

Almost surely, 2^135420161 is an apocalyptic number.

It is an amenable number.

135420161 is a deficient number, since it is larger than the sum of its proper divisors (1).

135420161 is an equidigital number, since it uses as much as digits as its factorization.

135420161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 135420161 is about 11637.0168428167. The cubic root of 135420161 is about 513.5244292839.

Adding to 135420161 its reverse (161024531), we get a palindrome (296444692).

The spelling of 135420161 in words is "one hundred thirty-five million, four hundred twenty thousand, one hundred sixty-one".