135242161 has 2 divisors, whose sum is σ = 135242162. Its totient is φ = 135242160.

The previous prime is 135242147. The next prime is 135242183. The reversal of 135242161 is 161242531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128709025 + 6533136 = 11345^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 135242161 - 2⁷ = 135242033 is a prime.

It is a super-2 number, since 2×135242161² = 36580884223899842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135242561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67621080 + 67621081.

It is an arithmetic number, because the mean of its divisors is an integer number (67621081).

Almost surely, 2^135242161 is an apocalyptic number.

It is an amenable number.

135242161 is a deficient number, since it is larger than the sum of its proper divisors (1).

135242161 is an equidigital number, since it uses as much as digits as its factorization.

135242161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 135242161 is about 11629.3663197958. The cubic root of 135242161 is about 513.2993337332.

Adding to 135242161 its reverse (161242531), we get a palindrome (296484692).

The spelling of 135242161 in words is "one hundred thirty-five million, two hundred forty-two thousand, one hundred sixty-one".