13553217 has 8 divisors (see below), whose sum is σ = 20078880. Its totient is φ = 9035460.

The previous prime is 13553209. The next prime is 13553257. The reversal of 13553217 is 71235531.

13553217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13553217 - 2³ = 13553209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 501971 = 13553217 / (1 + 3 + 5 + 5 + 3 + 2 + 1 + 7).

It is not an unprimeable number, because it can be changed into a prime (13553207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250959 + ... + 251012.

It is an arithmetic number, because the mean of its divisors is an integer number (2509860).

Almost surely, 2^13553217 is an apocalyptic number.

It is an amenable number.

13553217 is a deficient number, since it is larger than the sum of its proper divisors (6525663).

13553217 is an equidigital number, since it uses as much as digits as its factorization.

13553217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501980 (or 501974 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 13553217 is about 3681.4694077230. The cubic root of 13553217 is about 238.4226243205.

Adding to 13553217 its reverse (71235531), we get a palindrome (84788748).

The spelling of 13553217 in words is "thirteen million, five hundred fifty-three thousand, two hundred seventeen".