135803509 has 2 divisors, whose sum is σ = 135803510. Its totient is φ = 135803508.

The previous prime is 135803471. The next prime is 135803527. The reversal of 135803509 is 905308531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105001009 + 30802500 = 10247^2 + 5550^2 .

It is a cyclic number.

It is not a de Polignac number, because 135803509 - 2¹⁷ = 135672437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135803809) 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, 67901754 + 67901755.

It is an arithmetic number, because the mean of its divisors is an integer number (67901755).

Almost surely, 2^135803509 is an apocalyptic number.

It is an amenable number.

135803509 is a deficient number, since it is larger than the sum of its proper divisors (1).

135803509 is an equidigital number, since it uses as much as digits as its factorization.

135803509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 135803509 is about 11653.4762624721. The cubic root of 135803509 is about 514.0085351881.

The spelling of 135803509 in words is "one hundred thirty-five million, eight hundred three thousand, five hundred nine".