135131021125 has 16 divisors (see below), whose sum is σ = 168839064576. Its totient is φ = 107979464400.

The previous prime is 135131021117. The next prime is 135131021131. The reversal of 135131021125 is 521120131531.

It is not a de Polignac number, because 135131021125 - 2³ = 135131021117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 135131021125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518457 + ... + 734206.

It is an arithmetic number, because the mean of its divisors is an integer number (10552441536).

Almost surely, 2^135131021125 is an apocalyptic number.

It is an amenable number.

135131021125 is a deficient number, since it is larger than the sum of its proper divisors (33708043451).

135131021125 is an equidigital number, since it uses as much as digits as its factorization.

135131021125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253541 (or 1253531 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 135131021125 its reverse (521120131531), we get a palindrome (656251152656).

The spelling of 135131021125 in words is "one hundred thirty-five billion, one hundred thirty-one million, twenty-one thousand, one hundred twenty-five".