805881331 has 2 divisors, whose sum is σ = 805881332. Its totient is φ = 805881330.

The previous prime is 805881313. The next prime is 805881389. The reversal of 805881331 is 133188508.

Together with previous prime (805881313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805881331 - 2⁵ = 805881299 is a prime.

It is a super-2 number, since 2×805881331² = 1298889439308663122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805881631) 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, 402940665 + 402940666.

It is an arithmetic number, because the mean of its divisors is an integer number (402940666).

Almost surely, 2^805881331 is an apocalyptic number.

805881331 is a deficient number, since it is larger than the sum of its proper divisors (1).

805881331 is an equidigital number, since it uses as much as digits as its factorization.

805881331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 805881331 is about 28388.0490876002. The cubic root of 805881331 is about 930.5871079880.

The spelling of 805881331 in words is "eight hundred five million, eight hundred eighty-one thousand, three hundred thirty-one".