135099409 has 4 divisors (see below), whose sum is σ = 135128304. Its totient is φ = 135070516.

The previous prime is 135099407. The next prime is 135099431. The reversal of 135099409 is 904990531.

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 135099409 - 2¹ = 135099407 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135099407) 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, 5647 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (33782076).

Almost surely, 2^135099409 is an apocalyptic number.

It is an amenable number.

135099409 is a deficient number, since it is larger than the sum of its proper divisors (28895).

135099409 is an equidigital number, since it uses as much as digits as its factorization.

135099409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28894.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 135099409 is about 11623.2271336320. The cubic root of 135099409 is about 513.1186694044.

The spelling of 135099409 in words is "one hundred thirty-five million, ninety-nine thousand, four hundred nine".