13531121225 has 48 divisors (see below), whose sum is σ = 17974682880. Its totient is φ = 10074585600.

The previous prime is 13531121221. The next prime is 13531121249. The reversal of 13531121225 is 52212113531.

It is not a de Polignac number, because 13531121225 - 2² = 13531121221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13531121194 and 13531121203.

It is not an unprimeable number, because it can be changed into a prime (13531121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10991360 + ... + 10992590.

It is an arithmetic number, because the mean of its divisors is an integer number (374472560).

Almost surely, 2^13531121225 is an apocalyptic number.

It is an amenable number.

13531121225 is a deficient number, since it is larger than the sum of its proper divisors (4443561655).

13531121225 is a wasteful number, since it uses less digits than its factorization.

13531121225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1645 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

Adding to 13531121225 its reverse (52212113531), we get a palindrome (65743234756).

The spelling of 13531121225 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-five".