13531155121 has 16 divisors (see below), whose sum is σ = 15544627200. Its totient is φ = 11648782800.

The previous prime is 13531155109. The next prime is 13531155163. The reversal of 13531155121 is 12155113531.

It is a cyclic number.

It is not a de Polignac number, because 13531155121 - 2¹³ = 13531146929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13531155121.

It is not an unprimeable number, because it can be changed into a prime (13531155101) 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, 546120 + ... + 570358.

It is an arithmetic number, because the mean of its divisors is an integer number (971539200).

Almost surely, 2^13531155121 is an apocalyptic number.

13531155121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13531155121 is a deficient number, since it is larger than the sum of its proper divisors (2013472079).

13531155121 is a wasteful number, since it uses less digits than its factorization.

13531155121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26940.

The product of its digits is 2250, while the sum is 28.

Adding to 13531155121 its reverse (12155113531), we get a palindrome (25686268652).

The spelling of 13531155121 in words is "thirteen billion, five hundred thirty-one million, one hundred fifty-five thousand, one hundred twenty-one".