1687111 has 2 divisors, whose sum is σ = 1687112. Its totient is φ = 1687110.

The previous prime is 1687087. The next prime is 1687117. The reversal of 1687111 is 1117861.

It is a strong prime.

It is an emirp because it is prime and its reverse (1117861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687111 - 2⁷ = 1686983 is a prime.

1687111 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843555 + 843556.

It is an arithmetic number, because the mean of its divisors is an integer number (843556).

2^1687111 is an apocalyptic number.

1687111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687111 is an equidigital number, since it uses as much as digits as its factorization.

1687111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 25.

The square root of 1687111 is about 1298.8883708772. Note that the first 3 decimals coincide. The cubic root of 1687111 is about 119.0459300611.

It can be divided in two parts, 16871 and 11, that multiplied together give a palindrome (185581).

The spelling of 1687111 in words is "one million, six hundred eighty-seven thousand, one hundred eleven".