43131112520 has 64 divisors (see below), whose sum is σ = 98061678000. Its totient is φ = 17072114688.

The previous prime is 43131112511. The next prime is 43131112523. The reversal of 43131112520 is 2521113134.

It can be written as a sum of positive squares in 8 ways, for example, as 32213788324 + 10917324196 = 179482^2 + 104486^2 .

It is not an unprimeable number, because it can be changed into a prime (43131112523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3608474 + ... + 3620406.

Almost surely, 2^43131112520 is an apocalyptic number.

43131112520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43131112520 is an abundant number, since it is smaller than the sum of its proper divisors (54930565480).

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

43131112520 is a wasteful number, since it uses less digits than its factorization.

43131112520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12882 (or 12878 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 43131112520 its reverse (2521113134), we get a palindrome (45652225654).

The spelling of 43131112520 in words is "forty-three billion, one hundred thirty-one million, one hundred twelve thousand, five hundred twenty".