135899509 has 2 divisors, whose sum is σ = 135899510. Its totient is φ = 135899508.

The previous prime is 135899503. The next prime is 135899537. The reversal of 135899509 is 905998531.

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., 82755409 + 53144100 = 9097^2 + 7290^2 .

It is an emirp because it is prime and its reverse (905998531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135899509 - 2¹⁹ = 135375221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135899503) 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, 67949754 + 67949755.

It is an arithmetic number, because the mean of its divisors is an integer number (67949755).

Almost surely, 2^135899509 is an apocalyptic number.

It is an amenable number.

135899509 is a deficient number, since it is larger than the sum of its proper divisors (1).

135899509 is an equidigital number, since it uses as much as digits as its factorization.

135899509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 135899509 is about 11657.5944774211. The cubic root of 135899509 is about 514.1296248344.

The spelling of 135899509 in words is "one hundred thirty-five million, eight hundred ninety-nine thousand, five hundred nine".