849825817 has 4 divisors (see below), whose sum is σ = 858240036. Its totient is φ = 841411600.

The previous prime is 849825799. The next prime is 849825833. The reversal of 849825817 is 718528948.

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 742889536 + 106936281 = 27256^2 + 10341^2 .

It is a cyclic number.

It is not a de Polignac number, because 849825817 - 2¹⁹ = 849301529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (849825857) 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, 4206958 + ... + 4207159.

It is an arithmetic number, because the mean of its divisors is an integer number (214560009).

Almost surely, 2^849825817 is an apocalyptic number.

It is an amenable number.

849825817 is a deficient number, since it is larger than the sum of its proper divisors (8414219).

849825817 is a wasteful number, since it uses less digits than its factorization.

849825817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414218.

The product of its digits is 1290240, while the sum is 52.

The square root of 849825817 is about 29151.7721073694. The cubic root of 849825817 is about 947.2035276584.

The spelling of 849825817 in words is "eight hundred forty-nine million, eight hundred twenty-five thousand, eight hundred seventeen".