135124109 has 4 divisors (see below), whose sum is σ = 143072604. Its totient is φ = 127175616.

The previous prime is 135124097. The next prime is 135124117. The reversal of 135124109 is 901421531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46199209 + 88924900 = 6797^2 + 9430^2 .

It is a cyclic number.

It is not a de Polignac number, because 135124109 - 2⁸ = 135123853 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 (135124169) 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, 3974222 + ... + 3974255.

It is an arithmetic number, because the mean of its divisors is an integer number (35768151).

Almost surely, 2^135124109 is an apocalyptic number.

It is an amenable number.

135124109 is a deficient number, since it is larger than the sum of its proper divisors (7948495).

135124109 is an equidigital number, since it uses as much as digits as its factorization.

135124109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948494.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 135124109 is about 11624.2896127032. The cubic root of 135124109 is about 513.1499383762.

The spelling of 135124109 in words is "one hundred thirty-five million, one hundred twenty-four thousand, one hundred nine".