1685205341 has 4 divisors (see below), whose sum is σ = 1743315900. Its totient is φ = 1627094784.

The previous prime is 1685205317. The next prime is 1685205343. The reversal of 1685205341 is 1435025861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1449705625 + 235499716 = 38075^2 + 15346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685205341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685205343) 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, 29055236 + ... + 29055293.

It is an arithmetic number, because the mean of its divisors is an integer number (435828975).

Almost surely, 2^1685205341 is an apocalyptic number.

It is an amenable number.

1685205341 is a deficient number, since it is larger than the sum of its proper divisors (58110559).

1685205341 is an equidigital number, since it uses as much as digits as its factorization.

1685205341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58110558.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1685205341 is about 41051.2526118266. The cubic root of 1685205341 is about 1190.0109080280.

The spelling of 1685205341 in words is "one billion, six hundred eighty-five million, two hundred five thousand, three hundred forty-one".