785521 has 4 divisors (see below), whose sum is σ = 856944. Its totient is φ = 714100.

The previous prime is 785503. The next prime is 785527. The reversal of 785521 is 125587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 785521 - 2¹¹ = 783473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 785521.

It is not an unprimeable number, because it can be changed into a prime (785527) 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, 35695 + ... + 35716.

It is an arithmetic number, because the mean of its divisors is an integer number (214236).

2⁷⁸⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

785521 is a deficient number, since it is larger than the sum of its proper divisors (71423).

785521 is a wasteful number, since it uses less digits than its factorization.

785521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71422.

The product of its digits is 2800, while the sum is 28.

The square root of 785521 is about 886.2962258748. The cubic root of 785521 is about 92.2683171986.

The spelling of 785521 in words is "seven hundred eighty-five thousand, five hundred twenty-one".