849521 has 4 divisors (see below), whose sum is σ = 851700. Its totient is φ = 847344.

The previous prime is 849481. The next prime is 849523. The reversal of 849521 is 125948.

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 579121 + 270400 = 761^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (849523) 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, 326 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (212925).

2⁸⁴⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

849521 is a deficient number, since it is larger than the sum of its proper divisors (2179).

849521 is a wasteful number, since it uses less digits than its factorization.

849521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178.

The product of its digits is 2880, while the sum is 29.

The square root of 849521 is about 921.6946348981. The cubic root of 849521 is about 94.7090265914.

The spelling of 849521 in words is "eight hundred forty-nine thousand, five hundred twenty-one".