135403309 has 4 divisors (see below), whose sum is σ = 135553504. Its totient is φ = 135253116.

The previous prime is 135403273. The next prime is 135403321. The reversal of 135403309 is 903304531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903304531 = 61 ⋅14808271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135403309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135403339) 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 in 3 ways as a sum of consecutive naturals, for example, 73737 + ... + 75550.

It is an arithmetic number, because the mean of its divisors is an integer number (33888376).

Almost surely, 2^135403309 is an apocalyptic number.

It is an amenable number.

135403309 is a deficient number, since it is larger than the sum of its proper divisors (150195).

135403309 is an equidigital number, since it uses as much as digits as its factorization.

135403309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150194.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 135403309 is about 11636.2927515597. The cubic root of 135403309 is about 513.5031270085.

The spelling of 135403309 in words is "one hundred thirty-five million, four hundred three thousand, three hundred nine".