850191217 has 4 divisors (see below), whose sum is σ = 873169396. Its totient is φ = 827213040.

The previous prime is 850191203. The next prime is 850191241. The reversal of 850191217 is 712191058.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 591656976 + 258534241 = 24324^2 + 16079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850191217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850191817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11489034 + ... + 11489107.

It is an arithmetic number, because the mean of its divisors is an integer number (218292349).

Almost surely, 2^850191217 is an apocalyptic number.

It is an amenable number.

850191217 is a deficient number, since it is larger than the sum of its proper divisors (22978179).

850191217 is a wasteful number, since it uses less digits than its factorization.

850191217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22978178.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 850191217 is about 29158.0386343115. The cubic root of 850191217 is about 947.3392647191.

The spelling of 850191217 in words is "eight hundred fifty million, one hundred ninety-one thousand, two hundred seventeen".