811138111 has 12 divisors (see below), whose sum is σ = 965514792. Its totient is φ = 679090608.

The previous prime is 811138099. The next prime is 811138117. The reversal of 811138111 is 111831118.

It is not a de Polignac number, because 811138111 - 2¹¹ = 811136063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811138117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190380 + ... + 194593.

It is an arithmetic number, because the mean of its divisors is an integer number (80459566).

Almost surely, 2^811138111 is an apocalyptic number.

811138111 is a deficient number, since it is larger than the sum of its proper divisors (154376681).

811138111 is a wasteful number, since it uses less digits than its factorization.

811138111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385030 (or 385023 counting only the distinct ones).

The product of its digits is 192, while the sum is 25.

The square root of 811138111 is about 28480.4864951426. The cubic root of 811138111 is about 932.6061370325.

Adding to 811138111 its reverse (111831118), we get a palindrome (922969229).

The spelling of 811138111 in words is "eight hundred eleven million, one hundred thirty-eight thousand, one hundred eleven".