11121191 has 4 divisors (see below), whose sum is σ = 11133552. Its totient is φ = 11108832.

The previous prime is 11121163. The next prime is 11121197. The reversal of 11121191 is 19112111.

It is a happy number.

11121191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19112111 = 229 ⋅83459.

It is a cyclic number.

It is not a de Polignac number, because 11121191 - 2¹⁰ = 11120167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121197) 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, 4715 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (2783388).

Almost surely, 2^11121191 is an apocalyptic number.

11121191 is a deficient number, since it is larger than the sum of its proper divisors (12361).

11121191 is an equidigital number, since it uses as much as digits as its factorization.

11121191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12360.

The product of its digits is 18, while the sum is 17.

The square root of 11121191 is about 3334.8449739081. The cubic root of 11121191 is about 223.2117743967.

The spelling of 11121191 in words is "eleven million, one hundred twenty-one thousand, one hundred ninety-one".