1685065321 has 4 divisors (see below), whose sum is σ = 1687018752. Its totient is φ = 1683111892.

The previous prime is 1685065301. The next prime is 1685065363. The reversal of 1685065321 is 1235605861.

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 1685065321 - 2⁵ = 1685065289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685065301) 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, 975421 + ... + 977146.

It is an arithmetic number, because the mean of its divisors is an integer number (421754688).

Almost surely, 2^1685065321 is an apocalyptic number.

It is an amenable number.

1685065321 is a deficient number, since it is larger than the sum of its proper divisors (1953431).

1685065321 is an equidigital number, since it uses as much as digits as its factorization.

1685065321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953430.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1685065321 is about 41049.5471473194. The cubic root of 1685065321 is about 1189.9779486534.

The spelling of 1685065321 in words is "one billion, six hundred eighty-five million, sixty-five thousand, three hundred twenty-one".