849684561 has 24 divisors (see below), whose sum is σ = 1292002656. Its totient is φ = 492560640.

The previous prime is 849684559. The next prime is 849684637. The reversal of 849684561 is 165486948.

It is not a de Polignac number, because 849684561 - 2¹ = 849684559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (849684461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6880 + ... + 41793.

It is an arithmetic number, because the mean of its divisors is an integer number (53833444).

Almost surely, 2^849684561 is an apocalyptic number.

It is an amenable number.

849684561 is a deficient number, since it is larger than the sum of its proper divisors (442318095).

849684561 is a wasteful number, since it uses less digits than its factorization.

849684561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48733 (or 48710 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The square root of 849684561 is about 29149.3492380190. The cubic root of 849684561 is about 947.1510441209.

The spelling of 849684561 in words is "eight hundred forty-nine million, six hundred eighty-four thousand, five hundred sixty-one".