1685348809 has 9 divisors (see below), whose sum is σ = 1715980149. Its totient is φ = 1655256960.

The previous prime is 1685348807. The next prime is 1685348827. The reversal of 1685348809 is 9088435861.

The square root of 1685348809 is 41053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 834343225 + 851005584 = 28885^2 + 29172^2 .

It is not a de Polignac number, because 1685348809 - 2¹ = 1685348807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685348807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2503897 + ... + 2504569.

It is an arithmetic number, because the mean of its divisors is an integer number (190664461).

Almost surely, 2^1685348809 is an apocalyptic number.

1685348809 is the 41053-rd square number.

1685348809 is the 20527-th centered octagonal number.

It is an amenable number.

1685348809 is a deficient number, since it is larger than the sum of its proper divisors (30631340).

1685348809 is an frugal number, since it uses more digits than its factorization.

1685348809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The cubic root of 1685348809 is about 1190.0446771353.

The spelling of 1685348809 in words is "one billion, six hundred eighty-five million, three hundred forty-eight thousand, eight hundred nine".