1991068 has 12 divisors (see below), whose sum is σ = 3596992. Its totient is φ = 963360.

The previous prime is 1991063. The next prime is 1991071. The reversal of 1991068 is 8601991.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7905 + ... + 8152.

2^1991068 is an apocalyptic number.

It is an amenable number.

1991068 is a deficient number, since it is larger than the sum of its proper divisors (1605924).

1991068 is a wasteful number, since it uses less digits than its factorization.

1991068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16092 (or 16090 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1991068 is about 1411.0520897543. The cubic root of 1991068 is about 125.8042648330.

The spelling of 1991068 in words is "one million, nine hundred ninety-one thousand, sixty-eight".