136648181 has 2 divisors, whose sum is σ = 136648182. Its totient is φ = 136648180.

The previous prime is 136648163. The next prime is 136648201. The reversal of 136648181 is 181846631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 58767556 = 8825^2 + 7666^2 .

It is an emirp because it is prime and its reverse (181846631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136648181 - 2¹⁴ = 136631797 is a prime.

It is a super-2 number, since 2×136648181² = 37345450741217522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136648111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68324090 + 68324091.

It is an arithmetic number, because the mean of its divisors is an integer number (68324091).

Almost surely, 2^136648181 is an apocalyptic number.

It is an amenable number.

136648181 is a deficient number, since it is larger than the sum of its proper divisors (1).

136648181 is an equidigital number, since it uses as much as digits as its factorization.

136648181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 136648181 is about 11689.6612867953. The cubic root of 136648181 is about 515.0720117984.

The spelling of 136648181 in words is "one hundred thirty-six million, six hundred forty-eight thousand, one hundred eighty-one".