131521344 has 112 divisors (see below), whose sum is σ = 378439680. Its totient is φ = 40158720.

The previous prime is 131521331. The next prime is 131521361. The reversal of 131521344 is 443125131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 8.

It is a congruent number.

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, 112507 + ... + 113669.

Almost surely, 2^131521344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131521344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189219840).

131521344 is an abundant number, since it is smaller than the sum of its proper divisors (246918336).

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

131521344 is a wasteful number, since it uses less digits than its factorization.

131521344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1218 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 131521344 is about 11468.2755460444. The cubic root of 131521344 is about 508.5481507432.

Adding to 131521344 its reverse (443125131), we get a palindrome (574646475).

The spelling of 131521344 in words is "one hundred thirty-one million, five hundred twenty-one thousand, three hundred forty-four".