13131124520 has 16 divisors (see below), whose sum is σ = 29545030260. Its totient is φ = 5252449792.

The previous prime is 13131124507. The next prime is 13131124537. The reversal of 13131124520 is 2542113131.

It can be written as a sum of positive squares in 2 ways, for example, as 12125092996 + 1006031524 = 110114^2 + 31718^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164139017 + ... + 164139096.

Almost surely, 2^13131124520 is an apocalyptic number.

13131124520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13131124520 is an abundant number, since it is smaller than the sum of its proper divisors (16413905740).

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

13131124520 is a wasteful number, since it uses less digits than its factorization.

13131124520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328278124 (or 328278120 counting only the distinct ones).

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

Adding to 13131124520 its reverse (2542113131), we get a palindrome (15673237651).

The spelling of 13131124520 in words is "thirteen billion, one hundred thirty-one million, one hundred twenty-four thousand, five hundred twenty".