1683121205 has 8 divisors (see below), whose sum is σ = 2040568152. Its totient is φ = 1332615168.

The previous prime is 1683121201. The next prime is 1683121207. The reversal of 1683121205 is 5021213861.

It can be written as a sum of positive squares in 4 ways, for example, as 551404324 + 1131716881 = 23482^2 + 33641^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1683121205 - 2² = 1683121201 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 (1683121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1734692 + ... + 1735661.

It is an arithmetic number, because the mean of its divisors is an integer number (255071019).

Almost surely, 2^1683121205 is an apocalyptic number.

It is an amenable number.

1683121205 is a deficient number, since it is larger than the sum of its proper divisors (357446947).

1683121205 is an equidigital number, since it uses as much as digits as its factorization.

1683121205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470455.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1683121205 is about 41025.8601981726. The cubic root of 1683121205 is about 1189.5201334745.

The spelling of 1683121205 in words is "one billion, six hundred eighty-three million, one hundred twenty-one thousand, two hundred five".