1685471983 has 6 divisors (see below), whose sum is σ = 1825097064. Its totient is φ = 1555820136.

The previous prime is 1685471981. The next prime is 1685472011. The reversal of 1685471983 is 3891745861.

It is not a de Polignac number, because 1685471983 - 2¹ = 1685471981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1685471983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685471981) 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 in 5 ways as a sum of consecutive naturals, for example, 4986435 + ... + 4986772.

It is an arithmetic number, because the mean of its divisors is an integer number (304182844).

Almost surely, 2^1685471983 is an apocalyptic number.

1685471983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1685471983 is a deficient number, since it is larger than the sum of its proper divisors (139625081).

1685471983 is an equidigital number, since it uses as much as digits as its factorization.

1685471983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973233 (or 9973220 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The square root of 1685471983 is about 41054.5001552814. The cubic root of 1685471983 is about 1190.0736679673.

The spelling of 1685471983 in words is "one billion, six hundred eighty-five million, four hundred seventy-one thousand, nine hundred eighty-three".