11211775391 has 2 divisors, whose sum is σ = 11211775392. Its totient is φ = 11211775390.

The previous prime is 11211775357. The next prime is 11211775403. The reversal of 11211775391 is 19357711211.

It is a strong prime.

It is an emirp because it is prime and its reverse (19357711211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211775391 - 2²² = 11207581087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211475391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605887695 + 5605887696.

It is an arithmetic number, because the mean of its divisors is an integer number (5605887696).

Almost surely, 2^11211775391 is an apocalyptic number.

11211775391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211775391 is an equidigital number, since it uses as much as digits as its factorization.

11211775391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 38.

The spelling of 11211775391 in words is "eleven billion, two hundred eleven million, seven hundred seventy-five thousand, three hundred ninety-one".