135718409 has 2 divisors, whose sum is σ = 135718410. Its totient is φ = 135718408.

The previous prime is 135718397. The next prime is 135718439. The reversal of 135718409 is 904817531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 16581184 = 10915^2 + 4072^2 .

It is an emirp because it is prime and its reverse (904817531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135718409 - 2⁴ = 135718393 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135718439) 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, 67859204 + 67859205.

It is an arithmetic number, because the mean of its divisors is an integer number (67859205).

Almost surely, 2^135718409 is an apocalyptic number.

It is an amenable number.

135718409 is a deficient number, since it is larger than the sum of its proper divisors (1).

135718409 is an equidigital number, since it uses as much as digits as its factorization.

135718409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 135718409 is about 11649.8244192777. The cubic root of 135718409 is about 513.9011465383.

The spelling of 135718409 in words is "one hundred thirty-five million, seven hundred eighteen thousand, four hundred nine".