135243505 has 4 divisors (see below), whose sum is σ = 162292212. Its totient is φ = 108194800.

The previous prime is 135243503. The next prime is 135243509. The reversal of 135243505 is 505342531.

135243505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505342531 = 7789 ⋅64879.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 114147856 = 4593^2 + 10684^2 .

It is not a de Polignac number, because 135243505 - 2¹ = 135243503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135243503) 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, 13524346 + ... + 13524355.

It is an arithmetic number, because the mean of its divisors is an integer number (40573053).

Almost surely, 2^135243505 is an apocalyptic number.

It is an amenable number.

135243505 is a deficient number, since it is larger than the sum of its proper divisors (27048707).

135243505 is an equidigital number, since it uses as much as digits as its factorization.

135243505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27048706.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 135243505 is about 11629.4241044000. The cubic root of 135243505 is about 513.3010340709.

The spelling of 135243505 in words is "one hundred thirty-five million, two hundred forty-three thousand, five hundred five".