13555217 has 4 divisors (see below), whose sum is σ = 14597940. Its totient is φ = 12512496.

The previous prime is 13555187. The next prime is 13555231. The reversal of 13555217 is 71255531.

It is a happy number.

13555217 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71255531 = 4789 ⋅14879.

It can be written as a sum of positive squares in 2 ways, for example, as 1157776 + 12397441 = 1076^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 13555217 - 2¹⁰ = 13554193 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 13555217.

It is not an unprimeable number, because it can be changed into a prime (13555247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521342 + ... + 521367.

It is an arithmetic number, because the mean of its divisors is an integer number (3649485).

Almost surely, 2^13555217 is an apocalyptic number.

It is an amenable number.

13555217 is a deficient number, since it is larger than the sum of its proper divisors (1042723).

13555217 is a wasteful number, since it uses less digits than its factorization.

13555217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042722.

The product of its digits is 5250, while the sum is 29.

The square root of 13555217 is about 3681.7410283723. The cubic root of 13555217 is about 238.4343514698.

The spelling of 13555217 in words is "thirteen million, five hundred fifty-five thousand, two hundred seventeen".