849931517 has 4 divisors (see below), whose sum is σ = 870661596. Its totient is φ = 829201440.

The previous prime is 849931499. The next prime is 849931529. The reversal of 849931517 is 715139948.

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 223981156 + 625950361 = 14966^2 + 25019^2 .

It is a cyclic number.

It is not a de Polignac number, because 849931517 - 2¹⁰ = 849930493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849931547) 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, 10364978 + ... + 10365059.

It is an arithmetic number, because the mean of its divisors is an integer number (217665399).

Almost surely, 2^849931517 is an apocalyptic number.

It is an amenable number.

849931517 is a deficient number, since it is larger than the sum of its proper divisors (20730079).

849931517 is a wasteful number, since it uses less digits than its factorization.

849931517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20730078.

The product of its digits is 272160, while the sum is 47.

The square root of 849931517 is about 29153.5849768086. The cubic root of 849931517 is about 947.2427965926.

The spelling of 849931517 in words is "eight hundred forty-nine million, nine hundred thirty-one thousand, five hundred seventeen".