131331720 has 128 divisors (see below), whose sum is σ = 439084800. Its totient is φ = 31202304.

The previous prime is 131331709. The next prime is 131331727. The reversal of 131331720 is 27133131.

It is not an unprimeable number, because it can be changed into a prime (131331727) 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, 43789 + ... + 46691.

It is an arithmetic number, because the mean of its divisors is an integer number (3430350).

Almost surely, 2^131331720 is an apocalyptic number.

131331720 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 131331720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219542400).

131331720 is an abundant number, since it is smaller than the sum of its proper divisors (307753080).

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

131331720 is a wasteful number, since it uses less digits than its factorization.

131331720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959 (or 2955 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 131331720 is about 11460.0052356009. The cubic root of 131331720 is about 508.3036294268.

Adding to 131331720 its reverse (27133131), we get a palindrome (158464851).

It can be divided in two parts, 1313 and 31720, that added together give a palindrome (33033).

The spelling of 131331720 in words is "one hundred thirty-one million, three hundred thirty-one thousand, seven hundred twenty".