13097521 has 4 divisors (see below), whose sum is σ = 13129200. Its totient is φ = 13065844.

The previous prime is 13097509. The next prime is 13097527. The reversal of 13097521 is 12579031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12579031 = 17 ⋅739943.

It is a cyclic number.

It is not a de Polignac number, because 13097521 - 2¹¹ = 13095473 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 13097521.

It is not an unprimeable number, because it can be changed into a prime (13097527) 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 3 ways as a sum of consecutive naturals, for example, 15211 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (3282300).

Almost surely, 2^13097521 is an apocalyptic number.

It is an amenable number.

13097521 is a deficient number, since it is larger than the sum of its proper divisors (31679).

13097521 is an equidigital number, since it uses as much as digits as its factorization.

13097521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31678.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 13097521 is about 3619.0497371548. The cubic root of 13097521 is about 235.7199649338.

The spelling of 13097521 in words is "thirteen million, ninety-seven thousand, five hundred twenty-one".