131023520 has 24 divisors (see below), whose sum is σ = 309543444. Its totient is φ = 52409344.

The previous prime is 131023513. The next prime is 131023523. The reversal of 131023520 is 25320131.

It can be written as a sum of positive squares in 2 ways, for example, as 121264144 + 9759376 = 11012^2 + 3124^2 .

It is not an unprimeable number, because it can be changed into a prime (131023523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409289 + ... + 409608.

Almost surely, 2^131023520 is an apocalyptic number.

131023520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131023520 is an abundant number, since it is smaller than the sum of its proper divisors (178519924).

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

131023520 is an equidigital number, since it uses as much as digits as its factorization.

131023520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818912 (or 818904 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 131023520 is about 11446.5505721156. The cubic root of 131023520 is about 507.9057009746.

Adding to 131023520 its reverse (25320131), we get a palindrome (156343651).

The spelling of 131023520 in words is "one hundred thirty-one million, twenty-three thousand, five hundred twenty".