805012171 has 2 divisors, whose sum is σ = 805012172. Its totient is φ = 805012170.

The previous prime is 805012157. The next prime is 805012207. The reversal of 805012171 is 171210508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805012171 - 2²¹ = 802915019 is a prime.

It is not a weakly prime, because it can be changed into another prime (805012771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402506085 + 402506086.

It is an arithmetic number, because the mean of its divisors is an integer number (402506086).

Almost surely, 2^805012171 is an apocalyptic number.

805012171 is a deficient number, since it is larger than the sum of its proper divisors (1).

805012171 is an equidigital number, since it uses as much as digits as its factorization.

805012171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 805012171 is about 28372.7364031036. The cubic root of 805012171 is about 930.2524350389.

Adding to 805012171 its reverse (171210508), we get a palindrome (976222679).

The spelling of 805012171 in words is "eight hundred five million, twelve thousand, one hundred seventy-one".