135208181 has 2 divisors, whose sum is σ = 135208182. Its totient is φ = 135208180.

The previous prime is 135208109. The next prime is 135208193. The reversal of 135208181 is 181802531.

135208181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133864900 + 1343281 = 11570^2 + 1159^2 .

It is an emirp because it is prime and its reverse (181802531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135208181 is a prime.

It is a super-2 number, since 2×135208181² = 36562504418657522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135208481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67604090 + 67604091.

It is an arithmetic number, because the mean of its divisors is an integer number (67604091).

Almost surely, 2^135208181 is an apocalyptic number.

It is an amenable number.

135208181 is a deficient number, since it is larger than the sum of its proper divisors (1).

135208181 is an equidigital number, since it uses as much as digits as its factorization.

135208181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 135208181 is about 11627.9052713720. The cubic root of 135208181 is about 513.2563407982.

The spelling of 135208181 in words is "one hundred thirty-five million, two hundred eight thousand, one hundred eighty-one".