1681984103 has 2 divisors, whose sum is σ = 1681984104. Its totient is φ = 1681984102.

The previous prime is 1681984037. The next prime is 1681984141. The reversal of 1681984103 is 3014891861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681984103 - 2¹² = 1681980007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681984163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840992051 + 840992052.

It is an arithmetic number, because the mean of its divisors is an integer number (840992052).

Almost surely, 2^1681984103 is an apocalyptic number.

1681984103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681984103 is an equidigital number, since it uses as much as digits as its factorization.

1681984103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 1681984103 is about 41011.9995001463. Note that the first 3 decimals coincide. The cubic root of 1681984103 is about 1189.2521966525.

Adding to 1681984103 its sum of digits (41), we get a square (1681984144 = 41012²).

The spelling of 1681984103 in words is "one billion, six hundred eighty-one million, nine hundred eighty-four thousand, one hundred three".