11217655 has 4 divisors (see below), whose sum is σ = 13461192. Its totient is φ = 8974120.

The previous prime is 11217653. The next prime is 11217667. The reversal of 11217655 is 55671211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55671211 = 2113 ⋅26347.

It is not a de Polignac number, because 11217655 - 2¹ = 11217653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217653) 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, 1121761 + ... + 1121770.

It is an arithmetic number, because the mean of its divisors is an integer number (3365298).

Almost surely, 2^11217655 is an apocalyptic number.

11217655 is a deficient number, since it is larger than the sum of its proper divisors (2243537).

11217655 is an equidigital number, since it uses as much as digits as its factorization.

11217655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243536.

The product of its digits is 2100, while the sum is 28.

The square root of 11217655 is about 3349.2767876065. The cubic root of 11217655 is about 223.8552889195.

Adding to 11217655 its reverse (55671211), we get a palindrome (66888866).

The spelling of 11217655 in words is "eleven million, two hundred seventeen thousand, six hundred fifty-five".