785221 has 2 divisors, whose sum is σ = 785222. Its totient is φ = 785220.

The previous prime is 785219. The next prime is 785227. The reversal of 785221 is 122587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 225 = 886^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 785221 - 2¹ = 785219 is a prime.

Together with 785219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785227) 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 as a sum of consecutive naturals, namely, 392610 + 392611.

It is an arithmetic number, because the mean of its divisors is an integer number (392611).

2⁷⁸⁵²²¹ is an apocalyptic number.

It is an amenable number.

785221 is a deficient number, since it is larger than the sum of its proper divisors (1).

785221 is an equidigital number, since it uses as much as digits as its factorization.

785221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 785221 is about 886.1269660720. The cubic root of 785221 is about 92.2565695730.

The spelling of 785221 in words is "seven hundred eighty-five thousand, two hundred twenty-one".