1683888649 has 2 divisors, whose sum is σ = 1683888650. Its totient is φ = 1683888648.

The previous prime is 1683888637. The next prime is 1683888667. The reversal of 1683888649 is 9468883861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1683871225 + 17424 = 41035^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1683888649 - 2⁵ = 1683888617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1683888749) 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 as a sum of consecutive naturals, namely, 841944324 + 841944325.

It is an arithmetic number, because the mean of its divisors is an integer number (841944325).

Almost surely, 2^1683888649 is an apocalyptic number.

It is an amenable number.

1683888649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1683888649 is an equidigital number, since it uses as much as digits as its factorization.

1683888649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15925248, while the sum is 61.

The square root of 1683888649 is about 41035.2123060184. The cubic root of 1683888649 is about 1189.7008991008.

The spelling of 1683888649 in words is "one billion, six hundred eighty-three million, eight hundred eighty-eight thousand, six hundred forty-nine".