13431531124520 has 16 divisors (see below), whose sum is σ = 30220945030260. Its totient is φ = 5372612449792.

The previous prime is 13431531124519. The next prime is 13431531124523. The reversal of 13431531124520 is 2542113513431.

It can be written as a sum of positive squares in 2 ways, for example, as 13428721488484 + 2809636036 = 3664522^2 + 53006^2 .

It is not an unprimeable number, because it can be changed into a prime (13431531124523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167894139017 + ... + 167894139096.

Almost surely, 2^{13431531124520} is an apocalyptic number.

13431531124520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13431531124520 is an abundant number, since it is smaller than the sum of its proper divisors (16789413905740).

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

13431531124520 is a wasteful number, since it uses less digits than its factorization.

13431531124520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335788278124 (or 335788278120 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 13431531124520 its reverse (2542113513431), we get a palindrome (15973644637951).

The spelling of 13431531124520 in words is "thirteen trillion, four hundred thirty-one billion, five hundred thirty-one million, one hundred twenty-four thousand, five hundred twenty".