131538909642 has 128 divisors (see below), whose sum is σ = 314346700800. Its totient is φ = 35914233600.

The previous prime is 131538909637. The next prime is 131538909643. The reversal of 131538909642 is 246909835131.

It is not an unprimeable number, because it can be changed into a prime (131538909643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19929859 + ... + 19936457.

It is an arithmetic number, because the mean of its divisors is an integer number (2455833600).

Almost surely, 2^131538909642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131538909642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157173350400).

131538909642 is an abundant number, since it is smaller than the sum of its proper divisors (182807791158).

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

131538909642 is a wasteful number, since it uses less digits than its factorization.

131538909642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 131538909642 in words is "one hundred thirty-one billion, five hundred thirty-eight million, nine hundred nine thousand, six hundred forty-two".