131331240 has 128 divisors (see below), whose sum is σ = 440352000. Its totient is φ = 34815744.

The previous prime is 131331229. The next prime is 131331269. The reversal of 131331240 is 42133131.

131331240 is a `hidden beast` number, since 1 + 313 + 312 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298941 + ... + 299379.

It is an arithmetic number, because the mean of its divisors is an integer number (3440250).

Almost surely, 2^131331240 is an apocalyptic number.

131331240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131331240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220176000).

131331240 is an abundant number, since it is smaller than the sum of its proper divisors (309020760).

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

131331240 is a wasteful number, since it uses less digits than its factorization.

131331240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131331240 is about 11459.9842931830. The cubic root of 131331240 is about 508.3030101653.

Adding to 131331240 its reverse (42133131), we get a palindrome (173464371).

The spelling of 131331240 in words is "one hundred thirty-one million, three hundred thirty-one thousand, two hundred forty".