13351521 has 4 divisors (see below), whose sum is σ = 17802032. Its totient is φ = 8901012.

The previous prime is 13351453. The next prime is 13351537. The reversal of 13351521 is 12515331.

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: 12515331 = 3 ⋅4171777.

It is not a de Polignac number, because 13351521 - 2¹⁹ = 12827233 is a prime.

It is a super-2 number, since 2×13351521² = 356526226026882, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (13355521) 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, 2225251 + ... + 2225256.

It is an arithmetic number, because the mean of its divisors is an integer number (4450508).

Almost surely, 2^13351521 is an apocalyptic number.

It is an amenable number.

13351521 is a deficient number, since it is larger than the sum of its proper divisors (4450511).

13351521 is an equidigital number, since it uses as much as digits as its factorization.

13351521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4450510.

The product of its digits is 450, while the sum is 21.

The square root of 13351521 is about 3653.9733168155. The cubic root of 13351521 is about 237.2339906282.

Adding to 13351521 its reverse (12515331), we get a palindrome (25866852).

The spelling of 13351521 in words is "thirteen million, three hundred fifty-one thousand, five hundred twenty-one".