131708538 has 64 divisors (see below), whose sum is σ = 316673280. Its totient is φ = 40336704.

The previous prime is 131708531. The next prime is 131708561. The reversal of 131708538 is 835807131.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (131708531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261595 + ... + 262097.

It is an arithmetic number, because the mean of its divisors is an integer number (4948020).

Almost surely, 2^131708538 is an apocalyptic number.

131708538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131708538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158336640).

131708538 is an abundant number, since it is smaller than the sum of its proper divisors (184964742).

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

131708538 is a wasteful number, since it uses less digits than its factorization.

131708538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 131708538 is about 11476.4340280420. The cubic root of 131708538 is about 508.7893081368.

The spelling of 131708538 in words is "one hundred thirty-one million, seven hundred eight thousand, five hundred thirty-eight".