13520217 has 4 divisors (see below), whose sum is σ = 18026960. Its totient is φ = 9013476.

The previous prime is 13520203. The next prime is 13520231. The reversal of 13520217 is 71202531.

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.

It is an interprime number because it is at equal distance from previous prime (13520203) and next prime (13520231).

It is not a de Polignac number, because 13520217 - 2¹⁶ = 13454681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13520193 and 13520202.

It is not an unprimeable number, because it can be changed into a prime (13520237) 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, 2253367 + ... + 2253372.

It is an arithmetic number, because the mean of its divisors is an integer number (4506740).

Almost surely, 2^13520217 is an apocalyptic number.

It is an amenable number.

13520217 is a deficient number, since it is larger than the sum of its proper divisors (4506743).

13520217 is an equidigital number, since it uses as much as digits as its factorization.

13520217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506742.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13520217 is about 3676.9847701616. The cubic root of 13520217 is about 238.2289595741.

Adding to 13520217 its reverse (71202531), we get a palindrome (84722748).

The spelling of 13520217 in words is "thirteen million, five hundred twenty thousand, two hundred seventeen".