805723811 has 2 divisors, whose sum is σ = 805723812. Its totient is φ = 805723810.

The previous prime is 805723781. The next prime is 805723813. The reversal of 805723811 is 118327508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805723811 - 2¹⁰ = 805722787 is a prime.

It is a super-2 number, since 2×805723811² = 1298381719224727442, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 805723813, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_41425568 and since 805723811 and 41425568 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (805723813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402861905 + 402861906.

It is an arithmetic number, because the mean of its divisors is an integer number (402861906).

Almost surely, 2^805723811 is an apocalyptic number.

805723811 is a deficient number, since it is larger than the sum of its proper divisors (1).

805723811 is an equidigital number, since it uses as much as digits as its factorization.

805723811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 805723811 is about 28385.2745450876. The cubic root of 805723811 is about 930.5264722478.

The spelling of 805723811 in words is "eight hundred five million, seven hundred twenty-three thousand, eight hundred eleven".