181819091911 has 16 divisors (see below), whose sum is σ = 192677667840. Its totient is φ = 171311777280.

The previous prime is 181819091873. The next prime is 181819091921. The reversal of 181819091911 is 119190918181.

181819091911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 181819091911 - 2¹⁵ = 181819059143 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 (181819091921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179986 + ... + 629311.

It is an arithmetic number, because the mean of its divisors is an integer number (12042354240).

Almost surely, 2^181819091911 is an apocalyptic number.

181819091911 is a deficient number, since it is larger than the sum of its proper divisors (10858575929).

181819091911 is a wasteful number, since it uses less digits than its factorization.

181819091911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809514.

The product of its (nonzero) digits is 46656, while the sum is 49.

The spelling of 181819091911 in words is "one hundred eighty-one billion, eight hundred nineteen million, ninety-one thousand, nine hundred eleven".