13130111520 has 72 divisors (see below), whose sum is σ = 44806510476. Its totient is φ = 3501362688.

The previous prime is 13130111513. The next prime is 13130111563. The reversal of 13130111520 is 2511103131.

13130111520 is a `hidden beast` number, since 1 + 3 + 1 + 30 + 111 + 520 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11848757904 + 1281353616 = 108852^2 + 35796^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13130111493 and 13130111502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4557627 + ... + 4560506.

Almost surely, 2^13130111520 is an apocalyptic number.

13130111520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13130111520 is an abundant number, since it is smaller than the sum of its proper divisors (31676398956).

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

13130111520 is a wasteful number, since it uses less digits than its factorization.

13130111520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9118154 (or 9118143 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

Adding to 13130111520 its reverse (2511103131), we get a palindrome (15641214651).

The spelling of 13130111520 in words is "thirteen billion, one hundred thirty million, one hundred eleven thousand, five hundred twenty".