135115809 has 4 divisors (see below), whose sum is σ = 180154416. Its totient is φ = 90077204.

The previous prime is 135115789. The next prime is 135115819. The reversal of 135115809 is 908511531.

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 135115809 - 2¹⁹ = 134591521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135115809.

It is not an unprimeable number, because it can be changed into a prime (135115819) 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, 22519299 + ... + 22519304.

It is an arithmetic number, because the mean of its divisors is an integer number (45038604).

Almost surely, 2^135115809 is an apocalyptic number.

It is an amenable number.

135115809 is a deficient number, since it is larger than the sum of its proper divisors (45038607).

135115809 is an equidigital number, since it uses as much as digits as its factorization.

135115809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45038606.

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 135115809 is about 11623.9325961569. The cubic root of 135115809 is about 513.1394314140.

The spelling of 135115809 in words is "one hundred thirty-five million, one hundred fifteen thousand, eight hundred nine".