13531121325 has 36 divisors (see below), whose sum is σ = 24396304608. Its totient is φ = 7168788000.

The previous prime is 13531121323. The next prime is 13531121369. The reversal of 13531121325 is 52312113531.

13531121325 is a `hidden beast` number, since 1 + 3 + 5 + 311 + 21 + 325 = 666.

It is not a de Polignac number, because 13531121325 - 2¹ = 13531121323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531121323) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 165159 + ... + 233108.

It is an arithmetic number, because the mean of its divisors is an integer number (677675128).

Almost surely, 2^13531121325 is an apocalyptic number.

13531121325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13531121325 is a deficient number, since it is larger than the sum of its proper divisors (10865183283).

13531121325 is a wasteful number, since it uses less digits than its factorization.

13531121325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398434 (or 398426 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

Adding to 13531121325 its reverse (52312113531), we get a palindrome (65843234856).

The spelling of 13531121325 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty-five".