1678111 has 2 divisors, whose sum is σ = 1678112. Its totient is φ = 1678110.

The previous prime is 1678093. The next prime is 1678129. The reversal of 1678111 is 1118761.

It is a balanced prime because it is at equal distance from previous prime (1678093) and next prime (1678129).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678151) 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, 839055 + 839056.

It is an arithmetic number, because the mean of its divisors is an integer number (839056).

2^1678111 is an apocalyptic number.

1678111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678111 is an equidigital number, since it uses as much as digits as its factorization.

1678111 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 1678111 is about 1295.4192371584. The cubic root of 1678111 is about 118.8338665176.

The spelling of 1678111 in words is "one million, six hundred seventy-eight thousand, one hundred eleven".