805485851 has 2 divisors, whose sum is σ = 805485852. Its totient is φ = 805485850.

The previous prime is 805485797. The next prime is 805485871. The reversal of 805485851 is 158584508.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805485851 is a prime.

It is a super-2 number, since 2×805485851² = 1297614912322388402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805485871) 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, 402742925 + 402742926.

It is an arithmetic number, because the mean of its divisors is an integer number (402742926).

Almost surely, 2^805485851 is an apocalyptic number.

805485851 is a deficient number, since it is larger than the sum of its proper divisors (1).

805485851 is an equidigital number, since it uses as much as digits as its factorization.

805485851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256000, while the sum is 44.

The square root of 805485851 is about 28381.0826255800. The cubic root of 805485851 is about 930.4348569496.

The spelling of 805485851 in words is "eight hundred five million, four hundred eighty-five thousand, eight hundred fifty-one".