1820094211 has 4 divisors (see below), whose sum is σ = 1960101472. Its totient is φ = 1680086952.

The previous prime is 1820094197. The next prime is 1820094251. The reversal of 1820094211 is 1124900281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1124900281 = 89 ⋅12639329.

It is a cyclic number.

It is not a de Polignac number, because 1820094211 - 2⁷ = 1820094083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820094211.

It is not an unprimeable number, because it can be changed into a prime (1820094251) 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, 70003611 + ... + 70003636.

It is an arithmetic number, because the mean of its divisors is an integer number (490025368).

Almost surely, 2^1820094211 is an apocalyptic number.

1820094211 is a deficient number, since it is larger than the sum of its proper divisors (140007261).

1820094211 is a wasteful number, since it uses less digits than its factorization.

1820094211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140007260.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1820094211 is about 42662.5621710652. The cubic root of 1820094211 is about 1220.9502162251.

Adding to 1820094211 its reverse (1124900281), we get a palindrome (2944994492).

The spelling of 1820094211 in words is "one billion, eight hundred twenty million, ninety-four thousand, two hundred eleven".