135811309 has 2 divisors, whose sum is σ = 135811310. Its totient is φ = 135811308.

The previous prime is 135811307. The next prime is 135811339. The reversal of 135811309 is 903118531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125507209 + 10304100 = 11203^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 135811309 - 2¹ = 135811307 is a prime.

Together with 135811307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135811303) 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, 67905654 + 67905655.

It is an arithmetic number, because the mean of its divisors is an integer number (67905655).

Almost surely, 2^135811309 is an apocalyptic number.

It is an amenable number.

135811309 is a deficient number, since it is larger than the sum of its proper divisors (1).

135811309 is an equidigital number, since it uses as much as digits as its factorization.

135811309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 135811309 is about 11653.8109217543. The cubic root of 135811309 is about 514.0183758514.

The spelling of 135811309 in words is "one hundred thirty-five million, eight hundred eleven thousand, three hundred nine".