11011211917 has 2 divisors, whose sum is σ = 11011211918. Its totient is φ = 11011211916.

The previous prime is 11011211903. The next prime is 11011211921. The reversal of 11011211917 is 71911211011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5854392196 + 5156819721 = 76514^2 + 71811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011211917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011211891 and 11011211900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011211947) 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 as a sum of consecutive naturals, namely, 5505605958 + 5505605959.

It is an arithmetic number, because the mean of its divisors is an integer number (5505605959).

Almost surely, 2^11011211917 is an apocalyptic number.

It is an amenable number.

11011211917 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011211917 is an equidigital number, since it uses as much as digits as its factorization.

11011211917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 25.

Adding to 11011211917 its reverse (71911211011), we get a palindrome (82922422928).

The spelling of 11011211917 in words is "eleven billion, eleven million, two hundred eleven thousand, nine hundred seventeen".