1818181822 has 4 divisors (see below), whose sum is σ = 2727272736. Its totient is φ = 909090910.

The previous prime is 1818181817. The next prime is 1818181823. The reversal of 1818181822 is 2281818181.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818181823) 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, 454545454 + ... + 454545457.

It is an arithmetic number, because the mean of its divisors is an integer number (681818184).

Almost surely, 2^1818181822 is an apocalyptic number.

1818181822 is a deficient number, since it is larger than the sum of its proper divisors (909090914).

1818181822 is an equidigital number, since it uses as much as digits as its factorization.

1818181822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909090913.

The product of its digits is 16384, while the sum is 40.

The square root of 1818181822 is about 42640.1433158942. The cubic root of 1818181822 is about 1220.5224453247.

The spelling of 1818181822 in words is "one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred twenty-two".