11381391811 has 2 divisors, whose sum is σ = 11381391812. Its totient is φ = 11381391810.

The previous prime is 11381391793. The next prime is 11381391859. The reversal of 11381391811 is 11819318311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11381391811 - 2⁵ = 11381391779 is a prime.

It is not a weakly prime, because it can be changed into another prime (11381391211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690695905 + 5690695906.

It is an arithmetic number, because the mean of its divisors is an integer number (5690695906).

Almost surely, 2^11381391811 is an apocalyptic number.

11381391811 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381391811 is an equidigital number, since it uses as much as digits as its factorization.

11381391811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 37.

The spelling of 11381391811 in words is "eleven billion, three hundred eighty-one million, three hundred ninety-one thousand, eight hundred eleven".