11041991 has 4 divisors (see below), whose sum is σ = 11197584. Its totient is φ = 10886400.

The previous prime is 11041981. The next prime is 11041999. The reversal of 11041991 is 19914011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19914011 = 13 ⋅1531847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11041991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11041991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11041999) 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 in 3 ways as a sum of consecutive naturals, for example, 77690 + ... + 77831.

It is an arithmetic number, because the mean of its divisors is an integer number (2799396).

Almost surely, 2^11041991 is an apocalyptic number.

11041991 is a deficient number, since it is larger than the sum of its proper divisors (155593).

11041991 is an equidigital number, since it uses as much as digits as its factorization.

11041991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155592.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 11041991 is about 3322.9491419521. The cubic root of 11041991 is about 222.6806410826.

The spelling of 11041991 in words is "eleven million, forty-one thousand, nine hundred ninety-one".