805211217 has 12 divisors (see below), whose sum is σ = 1164091344. Its totient is φ = 536342040.

The previous prime is 805211201. The next prime is 805211311. The reversal of 805211217 is 712112508.

It is not a de Polignac number, because 805211217 - 2⁴ = 805211201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (805211917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27663 + ... + 48740.

It is an arithmetic number, because the mean of its divisors is an integer number (97007612).

Almost surely, 2^805211217 is an apocalyptic number.

It is an amenable number.

805211217 is a deficient number, since it is larger than the sum of its proper divisors (358880127).

805211217 is a wasteful number, since it uses less digits than its factorization.

805211217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77580 (or 77577 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 805211217 is about 28376.2438846300. The cubic root of 805211217 is about 930.3290996219.

The spelling of 805211217 in words is "eight hundred five million, two hundred eleven thousand, two hundred seventeen".