1683486821 has 2 divisors, whose sum is σ = 1683486822. Its totient is φ = 1683486820.

The previous prime is 1683486803. The next prime is 1683486901. The reversal of 1683486821 is 1286843861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1683460900 + 25921 = 41030^2 + 161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1683486821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1683486121) 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, 841743410 + 841743411.

It is an arithmetic number, because the mean of its divisors is an integer number (841743411).

Almost surely, 2^1683486821 is an apocalyptic number.

It is an amenable number.

1683486821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1683486821 is an equidigital number, since it uses as much as digits as its factorization.

1683486821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 47.

The square root of 1683486821 is about 41030.3158774095. The cubic root of 1683486821 is about 1189.6062584081.

The spelling of 1683486821 in words is "one billion, six hundred eighty-three million, four hundred eighty-six thousand, eight hundred twenty-one".