11217779 has 4 divisors (see below), whose sum is σ = 11228376. Its totient is φ = 11207184.

The previous prime is 11217769. The next prime is 11217799. The reversal of 11217779 is 97771211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97771211 = 307 ⋅318473.

It is a cyclic number.

It is not a de Polignac number, because 11217779 - 2⁸ = 11217523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11217749) 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, 3509 + ... + 5894.

It is an arithmetic number, because the mean of its divisors is an integer number (2807094).

Almost surely, 2^11217779 is an apocalyptic number.

11217779 is a deficient number, since it is larger than the sum of its proper divisors (10597).

11217779 is an equidigital number, since it uses as much as digits as its factorization.

11217779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10596.

The product of its digits is 6174, while the sum is 35.

The square root of 11217779 is about 3349.2952990144. The cubic root of 11217779 is about 223.8561137489.

The spelling of 11217779 in words is "eleven million, two hundred seventeen thousand, seven hundred seventy-nine".