131323240 has 64 divisors (see below), whose sum is σ = 303730560. Its totient is φ = 51083520.

The previous prime is 131323189. The next prime is 131323253. The reversal of 131323240 is 42323131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260829 + ... + 261331.

It is an arithmetic number, because the mean of its divisors is an integer number (4745790).

Almost surely, 2^131323240 is an apocalyptic number.

131323240 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 131323240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151865280).

131323240 is an abundant number, since it is smaller than the sum of its proper divisors (172407320).

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

131323240 is a wasteful number, since it uses less digits than its factorization.

131323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 131323240 is about 11459.6352472494. The cubic root of 131323240 is about 508.2926889179.

Adding to 131323240 its reverse (42323131), we get a palindrome (173646371).

The spelling of 131323240 in words is "one hundred thirty-one million, three hundred twenty-three thousand, two hundred forty".