135068809 has 4 divisors (see below), whose sum is σ = 135897616. Its totient is φ = 134240004.

The previous prime is 135068807. The next prime is 135068819. The reversal of 135068809 is 908860531.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 135068809 - 2¹ = 135068807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135068807) 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, 414159 + ... + 414484.

It is an arithmetic number, because the mean of its divisors is an integer number (33974404).

Almost surely, 2^135068809 is an apocalyptic number.

It is an amenable number.

135068809 is a deficient number, since it is larger than the sum of its proper divisors (828807).

135068809 is an equidigital number, since it uses as much as digits as its factorization.

135068809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828806.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 135068809 is about 11621.9107293078. The cubic root of 135068809 is about 513.0799260400.

The spelling of 135068809 in words is "one hundred thirty-five million, sixty-eight thousand, eight hundred nine".