1681313099 has 2 divisors, whose sum is σ = 1681313100. Its totient is φ = 1681313098.

The previous prime is 1681313063. The next prime is 1681313111. The reversal of 1681313099 is 9903131861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681313099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681313009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840656549 + 840656550.

It is an arithmetic number, because the mean of its divisors is an integer number (840656550).

Almost surely, 2^1681313099 is an apocalyptic number.

1681313099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681313099 is an equidigital number, since it uses as much as digits as its factorization.

1681313099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1681313099 is about 41003.8181027084. The cubic root of 1681313099 is about 1189.0940304489.

The spelling of 1681313099 in words is "one billion, six hundred eighty-one million, three hundred thirteen thousand, ninety-nine".