2131538538 has 16 divisors (see below), whose sum is σ = 4263642720. Its totient is φ = 710418576.

The previous prime is 2131538531. The next prime is 2131538543. The reversal of 2131538538 is 8358351312.

It is a junction number, because it is equal to n+sod(n) for n = 2131538496 and 2131538505.

It is not an unprimeable number, because it can be changed into a prime (2131538531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37656 + ... + 75372.

It is an arithmetic number, because the mean of its divisors is an integer number (266477670).

Almost surely, 2^2131538538 is an apocalyptic number.

2131538538 is an abundant number, since it is smaller than the sum of its proper divisors (2132104182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131538538 is a wasteful number, since it uses less digits than its factorization.

2131538538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47141.

The product of its digits is 86400, while the sum is 39.

The square root of 2131538538 is about 46168.5882175316. The cubic root of 2131538538 is about 1286.9580665522.

The spelling of 2131538538 in words is "two billion, one hundred thirty-one million, five hundred thirty-eight thousand, five hundred thirty-eight".