131523240 has 128 divisors (see below), whose sum is σ = 410572800. Its totient is φ = 33680640.

The previous prime is 131523193. The next prime is 131523251. The reversal of 131523240 is 42325131.

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, 366181 + ... + 366539.

It is an arithmetic number, because the mean of its divisors is an integer number (3207600).

Almost surely, 2^131523240 is an apocalyptic number.

131523240 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 131523240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205286400).

131523240 is an abundant number, since it is smaller than the sum of its proper divisors (279049560).

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

131523240 is a wasteful number, since it uses less digits than its factorization.

131523240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 131523240 is about 11468.3582085667. The cubic root of 131523240 is about 508.5505944598.

Adding to 131523240 its reverse (42325131), we get a palindrome (173848371).

The spelling of 131523240 in words is "one hundred thirty-one million, five hundred twenty-three thousand, two hundred forty".