11018891 has 4 divisors (see below), whose sum is σ = 11866512. Its totient is φ = 10171272.

The previous prime is 11018881. The next prime is 11018893. The reversal of 11018891 is 19881011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19881011 = 19 ⋅1046369.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11018891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11018893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423791 + ... + 423816.

It is an arithmetic number, because the mean of its divisors is an integer number (2966628).

Almost surely, 2^11018891 is an apocalyptic number.

11018891 is a deficient number, since it is larger than the sum of its proper divisors (847621).

11018891 is an equidigital number, since it uses as much as digits as its factorization.

11018891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847620.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 11018891 is about 3319.4714940785. The cubic root of 11018891 is about 222.5252489968.

The spelling of 11018891 in words is "eleven million, eighteen thousand, eight hundred ninety-one".