135309709 has 4 divisors (see below), whose sum is σ = 135370620. Its totient is φ = 135248800.

The previous prime is 135309683. The next prime is 135309751. The reversal of 135309709 is 907903531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907903531 = 12457 ⋅72883.

It can be written as a sum of positive squares in 2 ways, for example, as 87048900 + 48260809 = 9330^2 + 6947^2 .

It is a cyclic number.

It is not a de Polignac number, because 135309709 - 2⁹ = 135309197 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 (135309809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26992 + ... + 31609.

It is an arithmetic number, because the mean of its divisors is an integer number (33842655).

Almost surely, 2^135309709 is an apocalyptic number.

It is an amenable number.

135309709 is a deficient number, since it is larger than the sum of its proper divisors (60911).

135309709 is an equidigital number, since it uses as much as digits as its factorization.

135309709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60910.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 135309709 is about 11632.2701567665. The cubic root of 135309709 is about 513.3847769418.

The spelling of 135309709 in words is "one hundred thirty-five million, three hundred nine thousand, seven hundred nine".