131321440 has 24 divisors (see below), whose sum is σ = 310247280. Its totient is φ = 52528512.

The previous prime is 131321419. The next prime is 131321453. The reversal of 131321440 is 44123131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410220 + ... + 410539.

It is an arithmetic number, because the mean of its divisors is an integer number (12926970).

Almost surely, 2^131321440 is an apocalyptic number.

131321440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131321440 is an abundant number, since it is smaller than the sum of its proper divisors (178925840).

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

131321440 is an equidigital number, since it uses as much as digits as its factorization.

131321440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820774 (or 820766 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131321440 is about 11459.5567104491. The cubic root of 131321440 is about 508.2903665795.

Adding to 131321440 its reverse (44123131), we get a palindrome (175444571).

The spelling of 131321440 in words is "one hundred thirty-one million, three hundred twenty-one thousand, four hundred forty".