1801231118 has 4 divisors (see below), whose sum is σ = 2701846680. Its totient is φ = 900615558.

The previous prime is 1801231111. The next prime is 1801231123. The reversal of 1801231118 is 8111321081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8111321081 = 1319 ⋅6149599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801231111) 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 as a sum of consecutive naturals, namely, 450307778 + ... + 450307781.

It is an arithmetic number, because the mean of its divisors is an integer number (675461670).

Almost surely, 2^1801231118 is an apocalyptic number.

1801231118 is a deficient number, since it is larger than the sum of its proper divisors (900615562).

1801231118 is an equidigital number, since it uses as much as digits as its factorization.

1801231118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900615561.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 1801231118 is about 42440.9132559609. The cubic root of 1801231118 is about 1216.7176658508.

Adding to 1801231118 its reverse (8111321081), we get a palindrome (9912552199).

The spelling of 1801231118 in words is "one billion, eight hundred one million, two hundred thirty-one thousand, one hundred eighteen".