131831838 has 24 divisors (see below), whose sum is σ = 302438448. Its totient is φ = 41358912.

The previous prime is 131831831. The next prime is 131831849. The reversal of 131831838 is 838138131.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131831831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215106 + ... + 215717.

It is an arithmetic number, because the mean of its divisors is an integer number (12601602).

Almost surely, 2^131831838 is an apocalyptic number.

131831838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

131831838 is an abundant number, since it is smaller than the sum of its proper divisors (170606610).

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

131831838 is a wasteful number, since it uses less digits than its factorization.

131831838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430848 (or 430845 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 131831838 is about 11481.8046490959. The cubic root of 131831838 is about 508.9480276767.

Adding to 131831838 its reverse (838138131), we get a palindrome (969969969).

The spelling of 131831838 in words is "one hundred thirty-one million, eight hundred thirty-one thousand, eight hundred thirty-eight".