11111211919 has 2 divisors, whose sum is σ = 11111211920. Its totient is φ = 11111211918.

The previous prime is 11111211893. The next prime is 11111211949. The reversal of 11111211919 is 91911211111.

It is a weak prime.

It is an emirp because it is prime and its reverse (91911211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111211919 - 2²³ = 11102823311 is a prime.

It is a super-2 number, since 2×11111211919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111211949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555605959 + 5555605960.

It is an arithmetic number, because the mean of its divisors is an integer number (5555605960).

Almost surely, 2^11111211919 is an apocalyptic number.

11111211919 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111211919 is an equidigital number, since it uses as much as digits as its factorization.

11111211919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 28.

The spelling of 11111211919 in words is "eleven billion, one hundred eleven million, two hundred eleven thousand, nine hundred nineteen".