1991041 has 8 divisors (see below), whose sum is σ = 2237760. Its totient is φ = 1757712.

The previous prime is 1991027. The next prime is 1991047. The reversal of 1991041 is 1401991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1991041 - 2⁹ = 1990529 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990997 and 1991015.

It is not an unprimeable number, because it can be changed into a prime (1991047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3031 + ... + 3628.

It is an arithmetic number, because the mean of its divisors is an integer number (279720).

2^1991041 is an apocalyptic number.

It is an amenable number.

1991041 is a deficient number, since it is larger than the sum of its proper divisors (246719).

1991041 is a wasteful number, since it uses less digits than its factorization.

1991041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6695.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1991041 is about 1411.0425223926. The cubic root of 1991041 is about 125.8036961716.

The spelling of 1991041 in words is "one million, nine hundred ninety-one thousand, forty-one".