13531031121 has 8 divisors (see below), whose sum is σ = 18047281024. Its totient is φ = 9017734320.

The previous prime is 13531031117. The next prime is 13531031147. The reversal of 13531031121 is 12113013531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13531031121 - 2² = 13531031117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13531031161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727561 + ... + 745926.

It is an arithmetic number, because the mean of its divisors is an integer number (2255910128).

Almost surely, 2^13531031121 is an apocalyptic number.

It is an amenable number.

13531031121 is a deficient number, since it is larger than the sum of its proper divisors (4516249903).

13531031121 is a wasteful number, since it uses less digits than its factorization.

13531031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476551.

The product of its (nonzero) digits is 270, while the sum is 21.

Adding to 13531031121 its reverse (12113013531), we get a palindrome (25644044652).

The spelling of 13531031121 in words is "thirteen billion, five hundred thirty-one million, thirty-one thousand, one hundred twenty-one".