8121811 has 2 divisors, whose sum is σ = 8121812. Its totient is φ = 8121810.

The previous prime is 8121793. The next prime is 8121821. The reversal of 8121811 is 1181218.

8121811 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121811 - 2⁹ = 8121299 is a prime.

It is not a weakly prime, because it can be changed into another prime (8121821) 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, 4060905 + 4060906.

It is an arithmetic number, because the mean of its divisors is an integer number (4060906).

Almost surely, 2^8121811 is an apocalyptic number.

8121811 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121811 is an equidigital number, since it uses as much as digits as its factorization.

8121811 is an odious number, because the sum of its binary digits is odd.

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

The square root of 8121811 is about 2849.8791202435. The cubic root of 8121811 is about 201.0099827554.

It can be divided in two parts, 81218 and 11, that multiplied together give a palindrome (893398).

The spelling of 8121811 in words is "eight million, one hundred twenty-one thousand, eight hundred eleven".