135239128247 has 4 divisors (see below), whose sum is σ = 135240315840. Its totient is φ = 135237940656.

The previous prime is 135239128183. The next prime is 135239128253. The reversal of 135239128247 is 742821932531.

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

It is a cyclic number.

It is not a de Polignac number, because 135239128247 - 2⁶ = 135239128183 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 (135239128147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402422 + ... + 657587.

It is an arithmetic number, because the mean of its divisors is an integer number (33810078960).

Almost surely, 2^135239128247 is an apocalyptic number.

135239128247 is a deficient number, since it is larger than the sum of its proper divisors (1187593).

135239128247 is a wasteful number, since it uses less digits than its factorization.

135239128247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187592.

The product of its digits is 725760, while the sum is 47.

The spelling of 135239128247 in words is "one hundred thirty-five billion, two hundred thirty-nine million, one hundred twenty-eight thousand, two hundred forty-seven".