135261205 has 4 divisors (see below), whose sum is σ = 162313452. Its totient is φ = 108208960.

The previous prime is 135261179. The next prime is 135261239. The reversal of 135261205 is 502162531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502162531 = 13 ⋅38627887.

It can be written as a sum of positive squares in 2 ways, for example, as 40666129 + 94595076 = 6377^2 + 9726^2 .

It is not a de Polignac number, because 135261205 - 2⁹ = 135260693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135261205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13526116 + ... + 13526125.

It is an arithmetic number, because the mean of its divisors is an integer number (40578363).

Almost surely, 2^135261205 is an apocalyptic number.

It is an amenable number.

135261205 is a deficient number, since it is larger than the sum of its proper divisors (27052247).

135261205 is an equidigital number, since it uses as much as digits as its factorization.

135261205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27052246.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 135261205 is about 11630.1850802126. The cubic root of 135261205 is about 513.3234258596.

The spelling of 135261205 in words is "one hundred thirty-five million, two hundred sixty-one thousand, two hundred five".