1820009111 has 2 divisors, whose sum is σ = 1820009112. Its totient is φ = 1820009110.

The previous prime is 1820009033. The next prime is 1820009131. The reversal of 1820009111 is 1119000281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1820009111 - 2³⁰ = 746267287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820009131) 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, 910004555 + 910004556.

It is an arithmetic number, because the mean of its divisors is an integer number (910004556).

Almost surely, 2^1820009111 is an apocalyptic number.

1820009111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820009111 is an equidigital number, since it uses as much as digits as its factorization.

1820009111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 1820009111 is about 42661.5647978365. The cubic root of 1820009111 is about 1220.9311870851.

Adding to 1820009111 its reverse (1119000281), we get a palindrome (2939009392).

The spelling of 1820009111 in words is "one billion, eight hundred twenty million, nine thousand, one hundred eleven".