805939811 has 2 divisors, whose sum is σ = 805939812. Its totient is φ = 805939810.

The previous prime is 805939807. The next prime is 805939831. The reversal of 805939811 is 118939508.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805939811 - 2² = 805939807 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (805939831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402969905 + 402969906.

It is an arithmetic number, because the mean of its divisors is an integer number (402969906).

Almost surely, 2^805939811 is an apocalyptic number.

805939811 is a deficient number, since it is larger than the sum of its proper divisors (1).

805939811 is an equidigital number, since it uses as much as digits as its factorization.

805939811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 805939811 is about 28389.0790798152. The cubic root of 805939811 is about 930.6096172647.

The spelling of 805939811 in words is "eight hundred five million, nine hundred thirty-nine thousand, eight hundred eleven".