11019891 has 16 divisors (see below), whose sum is σ = 15012000. Its totient is φ = 7189248.

The previous prime is 11019889. The next prime is 11019929. The reversal of 11019891 is 19891011.

It is a happy number.

11019891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11019891 - 2¹ = 11019889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11019191) 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 15 ways as a sum of consecutive naturals, for example, 39645 + ... + 39921.

It is an arithmetic number, because the mean of its divisors is an integer number (938250).

Almost surely, 2^11019891 is an apocalyptic number.

11019891 is a deficient number, since it is larger than the sum of its proper divisors (3992109).

11019891 is a wasteful number, since it uses less digits than its factorization.

11019891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 11019891 is about 3319.6221170489. The cubic root of 11019891 is about 222.5319804219.

The spelling of 11019891 in words is "eleven million, nineteen thousand, eight hundred ninety-one".