13291553521 has 9 divisors (see below), whose sum is σ = 13737838233. Its totient is φ = 12859335060.

The previous prime is 13291553519. The next prime is 13291553551. The reversal of 13291553521 is 12535519231.

The square root of 13291553521 is 115289.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 13291553521 - 2¹ = 13291553519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13291553551) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3572100 + ... + 3575818.

Almost surely, 2^13291553521 is an apocalyptic number.

13291553521 is the 115289-th square number.

13291553521 is the 57645-th centered octagonal number.

It is an amenable number.

13291553521 is a deficient number, since it is larger than the sum of its proper divisors (446284712).

13291553521 is an frugal number, since it uses more digits than its factorization.

13291553521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500 (or 3750 counting only the distinct ones).

The product of its digits is 40500, while the sum is 37.

The spelling of 13291553521 in words is "thirteen billion, two hundred ninety-one million, five hundred fifty-three thousand, five hundred twenty-one".