1688111911 has 2 divisors, whose sum is σ = 1688111912. Its totient is φ = 1688111910.

The previous prime is 1688111903. The next prime is 1688111927. The reversal of 1688111911 is 1191118861.

It is a weak prime.

It is an emirp because it is prime and its reverse (1191118861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1161118891 and 1988111611.

It is a cyclic number.

It is not a de Polignac number, because 1688111911 - 2³ = 1688111903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688118911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844055955 + 844055956.

It is an arithmetic number, because the mean of its divisors is an integer number (844055956).

Almost surely, 2^1688111911 is an apocalyptic number.

1688111911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688111911 is an equidigital number, since it uses as much as digits as its factorization.

1688111911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 37.

The square root of 1688111911 is about 41086.6390813364. The cubic root of 1688111911 is about 1190.6946750177.

The spelling of 1688111911 in words is "one billion, six hundred eighty-eight million, one hundred eleven thousand, nine hundred eleven".