1681890703 has 2 divisors, whose sum is σ = 1681890704. Its totient is φ = 1681890702.

The previous prime is 1681890701. The next prime is 1681890713. The reversal of 1681890703 is 3070981861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681890703 - 2¹ = 1681890701 is a prime.

Together with 1681890701, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1681890703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681890701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840945351 + 840945352.

It is an arithmetic number, because the mean of its divisors is an integer number (840945352).

Almost surely, 2^1681890703 is an apocalyptic number.

1681890703 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681890703 is an equidigital number, since it uses as much as digits as its factorization.

1681890703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1681890703 is about 41010.8607932094. The cubic root of 1681890703 is about 1189.2301833230.

The spelling of 1681890703 in words is "one billion, six hundred eighty-one million, eight hundred ninety thousand, seven hundred three".