811020011 has 2 divisors, whose sum is σ = 811020012. Its totient is φ = 811020010.

The previous prime is 811019933. The next prime is 811020053. The reversal of 811020011 is 110020118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811020011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (811020211) 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, 405510005 + 405510006.

It is an arithmetic number, because the mean of its divisors is an integer number (405510006).

Almost surely, 2^811020011 is an apocalyptic number.

811020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

811020011 is an equidigital number, since it uses as much as digits as its factorization.

811020011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 811020011 is about 28478.4130702538. The cubic root of 811020011 is about 932.5608730060.

Adding to 811020011 its reverse (110020118), we get a palindrome (921040129).

The spelling of 811020011 in words is "eight hundred eleven million, twenty thousand, eleven".