1686809011 has 2 divisors, whose sum is σ = 1686809012. Its totient is φ = 1686809010.

The previous prime is 1686808967. The next prime is 1686809017. The reversal of 1686809011 is 1109086861.

It is a strong prime.

It is an emirp because it is prime and its reverse (1109086861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1106089891 and 1989806011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1686809011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1686809017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843404505 + 843404506.

It is an arithmetic number, because the mean of its divisors is an integer number (843404506).

Almost surely, 2^1686809011 is an apocalyptic number.

1686809011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686809011 is an equidigital number, since it uses as much as digits as its factorization.

1686809011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 1686809011 is about 41070.7805014709. The cubic root of 1686809011 is about 1190.3882665444.

The spelling of 1686809011 in words is "one billion, six hundred eighty-six million, eight hundred nine thousand, eleven".