1991082 has 16 divisors (see below), whose sum is σ = 4119840. Its totient is φ = 640752.

The previous prime is 1991071. The next prime is 1991089. The reversal of 1991082 is 2801991.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1991089) 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 7 ways as a sum of consecutive naturals, for example, 5548 + ... + 5895.

It is an arithmetic number, because the mean of its divisors is an integer number (257490).

2^1991082 is an apocalyptic number.

1991082 is an abundant number, since it is smaller than the sum of its proper divisors (2128758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991082 is a wasteful number, since it uses less digits than its factorization.

1991082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11477.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1991082 is about 1411.0570505830. The cubic root of 1991082 is about 125.8045596924.

The spelling of 1991082 in words is "one million, nine hundred ninety-one thousand, eighty-two".