1685916847 has 2 divisors, whose sum is σ = 1685916848. Its totient is φ = 1685916846.

The previous prime is 1685916839. The next prime is 1685916853. The reversal of 1685916847 is 7486195861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1685916847 - 2³ = 1685916839 is a prime.

It is a super-3 number, since 3×1685916847³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685916857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842958423 + 842958424.

It is an arithmetic number, because the mean of its divisors is an integer number (842958424).

Almost surely, 2^1685916847 is an apocalyptic number.

1685916847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685916847 is an equidigital number, since it uses as much as digits as its factorization.

1685916847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The square root of 1685916847 is about 41059.9177666006. The cubic root of 1685916847 is about 1190.1783615617.

The spelling of 1685916847 in words is "one billion, six hundred eighty-five million, nine hundred sixteen thousand, eight hundred forty-seven".