11109391 has 4 divisors (see below), whose sum is σ = 11592432. Its totient is φ = 10626352.

The previous prime is 11109379. The next prime is 11109403. The reversal of 11109391 is 19390111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19390111 = 13 ⋅1491547.

It is an interprime number because it is at equal distance from previous prime (11109379) and next prime (11109403).

It is a cyclic number.

It is not a de Polignac number, because 11109391 - 2⁹ = 11108879 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 (11109331) 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, 241486 + ... + 241531.

It is an arithmetic number, because the mean of its divisors is an integer number (2898108).

Almost surely, 2^11109391 is an apocalyptic number.

11109391 is a deficient number, since it is larger than the sum of its proper divisors (483041).

11109391 is an equidigital number, since it uses as much as digits as its factorization.

11109391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483040.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 11109391 is about 3333.0753066800. The cubic root of 11109391 is about 223.1328011092.

It can be divided in two parts, 1110 and 9391, that added together give a palindrome (10501).

The spelling of 11109391 in words is "eleven million, one hundred nine thousand, three hundred ninety-one".