899817217 has 4 divisors (see below), whose sum is σ = 969033940. Its totient is φ = 830600496.

The previous prime is 899817197. The next prime is 899817223. The reversal of 899817217 is 712718998.

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 157854096 + 741963121 = 12564^2 + 27239^2 .

It is a cyclic number.

It is not a de Polignac number, because 899817217 - 2²⁷ = 765599489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (899817227) 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 in 3 ways as a sum of consecutive naturals, for example, 34608342 + ... + 34608367.

It is an arithmetic number, because the mean of its divisors is an integer number (242258485).

Almost surely, 2^899817217 is an apocalyptic number.

It is an amenable number.

899817217 is a deficient number, since it is larger than the sum of its proper divisors (69216723).

899817217 is a wasteful number, since it uses less digits than its factorization.

899817217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69216722.

The product of its digits is 508032, while the sum is 52.

The square root of 899817217 is about 29996.9534619768. The cubic root of 899817217 is about 965.4240190521.

The spelling of 899817217 in words is "eight hundred ninety-nine million, eight hundred seventeen thousand, two hundred seventeen".