131331018 has 64 divisors (see below), whose sum is σ = 342316800. Its totient is φ = 32596992.

The previous prime is 131331017. The next prime is 131331023. The reversal of 131331018 is 810133131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 131330985 and 131331003.

It is not an unprimeable number, because it can be changed into a prime (131331017) 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, 2208 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (5348700).

Almost surely, 2^131331018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131331018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171158400).

131331018 is an abundant number, since it is smaller than the sum of its proper divisors (210985782).

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

131331018 is a wasteful number, since it uses less digits than its factorization.

131331018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14191.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 131331018 is about 11459.9746073017. The cubic root of 131331018 is about 508.3027237563.

Adding to 131331018 its reverse (810133131), we get a palindrome (941464149).

The spelling of 131331018 in words is "one hundred thirty-one million, three hundred thirty-one thousand, eighteen".