135256405 has 4 divisors (see below), whose sum is σ = 162307692. Its totient is φ = 108205120.

The previous prime is 135256391. The next prime is 135256409. The reversal of 135256405 is 504652531.

135256405 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: 504652531 = 17 ⋅29685443.

It can be written as a sum of positive squares in 2 ways, for example, as 22344529 + 112911876 = 4727^2 + 10626^2 .

It is not a de Polignac number, because 135256405 - 2¹⁵ = 135223637 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135256409) 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, 13525636 + ... + 13525645.

It is an arithmetic number, because the mean of its divisors is an integer number (40576923).

Almost surely, 2^135256405 is an apocalyptic number.

It is an amenable number.

135256405 is a deficient number, since it is larger than the sum of its proper divisors (27051287).

135256405 is an equidigital number, since it uses as much as digits as its factorization.

135256405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27051286.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 135256405 is about 11629.9787188111. The cubic root of 135256405 is about 513.3173537032.

The spelling of 135256405 in words is "one hundred thirty-five million, two hundred fifty-six thousand, four hundred five".