181818201001 has 4 divisors (see below), whose sum is σ = 181826064900. Its totient is φ = 181810337104.

The previous prime is 181818200987. The next prime is 181818201007. The reversal of 181818201001 is 100102818181.

181818201001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60243248025 + 121574952976 = 245445^2 + 348676^2 .

It is a cyclic number.

It is not a de Polignac number, because 181818201001 - 2¹⁷ = 181818069929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181818201007) 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 3 ways as a sum of consecutive naturals, for example, 3897166 + ... + 3943543.

It is an arithmetic number, because the mean of its divisors is an integer number (45456516225).

Almost surely, 2^181818201001 is an apocalyptic number.

It is an amenable number.

181818201001 is a deficient number, since it is larger than the sum of its proper divisors (7863899).

181818201001 is an equidigital number, since it uses as much as digits as its factorization.

181818201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863898.

The product of its (nonzero) digits is 1024, while the sum is 31.

The spelling of 181818201001 in words is "one hundred eighty-one billion, eight hundred eighteen million, two hundred one thousand, one".