1820820011 has 2 divisors, whose sum is σ = 1820820012. Its totient is φ = 1820820010.

The previous prime is 1820819971. The next prime is 1820820083. The reversal of 1820820011 is 1100280281.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1100280281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820820011 - 2¹⁴ = 1820803627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820820511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910410005 + 910410006.

It is an arithmetic number, because the mean of its divisors is an integer number (910410006).

Almost surely, 2^1820820011 is an apocalyptic number.

1820820011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820820011 is an equidigital number, since it uses as much as digits as its factorization.

1820820011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1820820011 is about 42671.0676102673. The cubic root of 1820820011 is about 1221.1124876605.

The spelling of 1820820011 in words is "one billion, eight hundred twenty million, eight hundred twenty thousand, eleven".