1802001811 has 4 divisors (see below), whose sum is σ = 1806163912. Its totient is φ = 1797839712.

The previous prime is 1802001767. The next prime is 1802001827. The reversal of 1802001811 is 1181002081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1181002081 = 7 ⋅168714583.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1802001811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1802001841) 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 3 ways as a sum of consecutive naturals, for example, 2080401 + ... + 2081266.

It is an arithmetic number, because the mean of its divisors is an integer number (451540978).

Almost surely, 2^1802001811 is an apocalyptic number.

1802001811 is a deficient number, since it is larger than the sum of its proper divisors (4162101).

1802001811 is an equidigital number, since it uses as much as digits as its factorization.

1802001811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162100.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 1802001811 is about 42449.9918845693. The cubic root of 1802001811 is about 1216.8911734905.

Adding to 1802001811 its reverse (1181002081), we get a palindrome (2983003892).

The spelling of 1802001811 in words is "one billion, eight hundred two million, one thousand, eight hundred eleven".