1685130859 has 4 divisors (see below), whose sum is σ = 1685217816. Its totient is φ = 1685043904.

The previous prime is 1685130817. The next prime is 1685130871. The reversal of 1685130859 is 9580315861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9580315861 = 1249 ⋅7670389.

It is a cyclic number.

It is not a de Polignac number, because 1685130859 - 2¹¹ = 1685128811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685130059) 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, 252 + ... + 58054.

It is an arithmetic number, because the mean of its divisors is an integer number (421304454).

Almost surely, 2^1685130859 is an apocalyptic number.

1685130859 is a deficient number, since it is larger than the sum of its proper divisors (86957).

1685130859 is an equidigital number, since it uses as much as digits as its factorization.

1685130859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86956.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1685130859 is about 41050.3454187660. The cubic root of 1685130859 is about 1189.9933759017.

The spelling of 1685130859 in words is "one billion, six hundred eighty-five million, one hundred thirty thousand, eight hundred fifty-nine".