805180217 has 2 divisors, whose sum is σ = 805180218. Its totient is φ = 805180216.

The previous prime is 805180213. The next prime is 805180237. The reversal of 805180217 is 712081508.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 712943401 + 92236816 = 26701^2 + 9604^2 .

It is a cyclic number.

It is not a de Polignac number, because 805180217 - 2² = 805180213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (805180213) 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, 402590108 + 402590109.

It is an arithmetic number, because the mean of its divisors is an integer number (402590109).

Almost surely, 2^805180217 is an apocalyptic number.

It is an amenable number.

805180217 is a deficient number, since it is larger than the sum of its proper divisors (1).

805180217 is an equidigital number, since it uses as much as digits as its factorization.

805180217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 805180217 is about 28375.6976478112. The cubic root of 805180217 is about 930.3171604886.

The spelling of 805180217 in words is "eight hundred five million, one hundred eighty thousand, two hundred seventeen".